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By W. G. KLEE, 

state Insi^ector of Fruit Pests. 




r '* ! 1 





To the honorable the State Board 0/ Horticulture: 

Gentlemen: I herewith submit to your consideration this short treatise 
on beneficial and injurious insects. 

This was prepared in accordance with a resohition adopted by you at 
your November (1887) meeting. Some of the most destructive insects have 
been treated at some length, notably the fluted or cottony scale. In the 
preparation of this treatise, the works of Professor Riley, Professor Corn- 
stock, and that of the late Matthew Cooke were freely made use of. 

I trust that this little publication will be judged charitably, as neither 
time nor knowledge has been sufficient to do justice to the undertaking. 

Respectfully submitted. 

W. G. KLEE, 
Inspector of Fruit Pests. 

San Francisco, California, October 12, 1888. 



Hon. ELLWOOD COOPER, President 1 Santa Barbara, 

Commissioner for the Los Angeles District. 

Rev. N. R. peck, Vice-President .Penrjm, 

Commissioner for the El Dorado District. 

Gen. M. G. VALLEJO, Treasurer -.. Sonoma, 

Commissioner for the Sonoma District. 

Dr. EDWIN KIMBALL, Auditor Haywards, 

Commissioner for the State at large. 

FRANK A. KIMBALL ....National City, 

Commissioner for the State at large. 

SOL. RUNYON Courtland, 

Commissioner for the Sacramento District. 

DRURY MELONE ...Napa City, 

Commissioner for the Napa District. 

Commissioner for the San Joaquin District. 

A. BLOCK- Santa Clara, 

Commissioner for the San Francisco District. 

B. M. LELONG, Secretary. 

Office of the Board: 
No. 220 Sutter Street, San Francisco. 

W. G. KLEE.. Inspector of Fruit Pests. 


Insects sucking the sap of plants... 7 

General remedies for scale insects 36 

Larva of lepidopterous insects infesting fruit 39 

Moth larva boring into the wood, twigs, and roots 44 

Larva of beetles boring into the wood of trees 48 

Leaf-eating caterpillars 50 

Miscellaneous insects feeding on foliage .-. 56 

Beneficial insects 58 


I am under great obligations to Professor Riley, Professor Comstock, Mr. 
E. J. Wickson, and Mr. J. J. Rivers, of Berkeley, Mr. D. W. Coquillett, of 
Los Angeles, and especially to Mr. Albert Keobele, of Alameda, for assist- 
ance rendered me in identifying insects in the past two years. The electro 
cuts of the Fluted Scale, in its various stages, the Fall Web Moth, the Cod- 
lin Moth, the Parasite of the Fluted Scale, and that of two Gas Fumigators 
were kindly loaned by Professor Riley. To Mr. Robert J. Cooke my thanks 
are due for the loan of a number of wood cuts. To the "Pacific Rural 
Press " my thanks are also due for the loan of a great number of cuts, and 
other favors shown me. (W. G. K.). 




Aphideans — General mode of reproduction — Pluni aphis — Honey dew— Woolly aphis — 
Remedies for the root form — Gas lime — Remedies for the branch form — Rosin solutions- 
Resistant stock — Scale insects — Classification of the coccidaj — Pernicious scale — Habits of 
pernicious scale — Aspidiotus rapax — Rose scale — Scale insects affecting citrus trees — Aspi- 
(liotus nerii — Lecanium oleas — Remedies — Parasites — -Lecanium hemisphericum — Tlie 
brown apricot scale — Icerya purchasi — Rate of growth of icerya in different stages— Hab- 
its of icerya — Natural enemies — Banding of trunk — Gas remedies — Modes of treatment — 
The process — Doses of gas according to size of trees— Dry gas — The titus fumigator — Cost 
of treatment — Mealy bugs. 


The insects of this family, hke the scale insects, belong to the Order Hem- 
iptera. They take their nourishment direct from the trees, by inserting 
their beaks into the bark. INIost of them work only on the soft, tender, and 
sappy shoots, although some, as the woolly aphis, find attachment on the 
wounds of older growth, as well as on the roots. These insects are remark- 
able for their powers of multiplication and extraordinary quickness of 
development, and some scientists have calculated that a single aphis may 
in five generations be the progenitor of nearly six millions of descendants — 
a statement any one watching their increase in twenty-four hours on a 
plum tree will hardly doubt. 

Latrielle, a French naturalist, claims that an average aphis produces 
twenty-five young in a day; but Mr. Buckton, an authority on aphidse, 
says that the highest number he has seen produced is eight, but as these 
are ready to increase in five days, it will be seen that the rate of increase 
is prodigious, and were it not for the natural checks, especially of certain 
insects — syrphus flies and ladybugs, in particular (see chapter on these 
insects) — they would literally fill the earth. 


In regard to this, Mr. Buckton says: 

The extreme variety of the males of some living forms, such as the Entomostroca', would 
seem to prove little more than that the influence of the male element sometimes is exerted 
at a minimum. That the male, in such cases, is not wholly absent might even show how 
necessary is the conjunction of primordial cells to perpetuate every species, though such 
a union may be deferred to very long periods. It maj^ be pretty safely asserted that all 
originallj' proceed from impregnated ova, and at the end of their generations they again 
produce ova. We are in better position to state this, now that the true sexes of twelve, 
or more, species are known, and have been satisfactorily made out bv dissection. 

The egg-laying process happens at different seasons of the year according 
to the different genera. With very few exceptions, the egg-laying female 
oviposits late in autumn and dies. The male generally appears before the 
female. The egg when newly laid is commonly yellow, but changes into 
shining black or brown. They are usually found at the base of the twigs 
and are fastened by a gluey substance. The eggs of the aphis are very 

hardy and will endure great cold, while strong caustic solutions likewise 
affect them but little. From these eggs, which the individuals produce at 
a prodigious rate, are produced the 3'oung, being born alive and ready to 
reproduce again after five days, until at the end of the season the cycle 
is finished and winter eggs again are laid. 

There exists a very large number of species of aphis, each species being 
especially adapted to a certain family of plants, yet there are certain spe- 
cies of aphis common to very distinct plants. Thus, an aphis affecting the 
hop vine is also found on the plum, but such cases are exceptions to the 

Nearly all fruit trees are subject to the aphis; of the most formidable 
and troublesome are those of the plum and the apple. 


The plum aphis make their appearance in the month of INIay, when the 
shoots are very sappy, and when taken in time can be checked so as to do 
little harm; but to do this the most thorough spraying is necessary. As 
one of the best remedies against them the rosin solution, given under the 
head of woolly aphis, is recommended. 


Eriosoma lanigera. (Figure No. 1). 

There is no insect so commonly met with in any old apple orchard as 
this, but a description to new planters will not be out of place. 

In form, the woolly aphis resembles closely the green aphis, so common on roses and 
other plants; but its color is reddish-brown, "and when crushed it yields a red juice, hence 
the German name Blutlans, or blood louse. The insects are always surrounded by a whitish 
woolly substance, hence the name " woolly " aphis. Like all aphides, this species increases 
with astonishing rapidity, and only a few need be left on a tree to soon spread all over it. 
While the i:)resence of the woolly aphis makes itself so conspicuous above ground on the 
branches, covering them as if with snow, yet the most serious trouble lies out of sight, at 
tlie roots, which, in our dry climate, they inhabit as freely as they do the branches, sapping 
the vitality of the tree to such an extent that the fruit becomes small and valueless. If 
allowed to go unchecked, the trees gradually die. To the apple tree the woolly aphis is 
what the phylloxera is to the grapevine — sucking and causing swellings and knobs all over 
the roots. 

Figure No. 1. 
o, the gall; '>, larva; r,female; (?, leg; e, beak ;/, aiiteuiue of female ; 3, of larva. 

Naturalists maintain that there are two forms of woolly aphis, one living 
on the roots and the other living on the branches, but they are gradually 


interchangeable. At any rate, when a tree is affected on the root it will 
sooner or later be affected above ground. 

Remedies for the Root Form. — Liberal dressing of ashes has a tendency of 
discouraging the aphis, especially in moist localities, where heavy dews often 
moisten the ground. 

Gaslime. — About one and a half to two shovelfuls placed around each 
tree in such a manner that it will not come in direct contact with the bark 
of the tree, is one of the best remedies. Add to this wood ashes placed 
directly around the base of the tree to the depth of one inch. Thus the 
migration to the upper part of the tree can be prevented. 

Remedy Against the Branch Form. — For the treatment, of small trees 
aflFected brushing with a rosin solution is the best; by diluting it suffi- 
ciently it can be sprayed on larger trees, and if thoroughly done it is the 
most effective wash I know of, being harmless to the tree. 

In many instances the lady-bugs are so numerous that the aphis gain 
but little headway. Lady-bugs should always be protected, and persons 
ought to make themselves familiar with all their stages. (See chapter on 
Beneficial Insects.) 

Rosin Solution. — One pound concentrated lye; four pounds rosin. Dis- 
solve the lye in two quarts of water. Add the rosin; heat until dissolved 
and add two and a half gallons of water. Use one quart of the solution 
to the gallon of water. Use at a temperature of 100° F. This solution is 
well adapted to all kinds of trees affected with aphis. 


Apple trees with very tough and wiry roots are but little afltected by the 
woolly aphis, and some varieties exist that are altogether exempt. At the 
University grounds in Berkeley are two trees originally donated by the 
well known nurseryman, J. Rock. These trees, after five years' exposure 
in the midst of a l^adly affected orchard, have remained exempt. Such 
varieties must be propagated by root-grafting. No doubt other varieties 
are almosfas good. The seedlings of Rawle's Janet and American Russet 
are considered resistant, and I believe those of Smith's Cider will likewise 
prove so. In Australia the Northern Spy bears the reputation of being 


The presence of all aphis is always accompanied by a sticky, viscid 
solution on the leaves, which is an excretion from the body of the aphis. 
Invariably where this is found ants make their appearance, and the ever 
present connection of aphis with ants is a most remarkable fact. 

Not alone do ants naturally follow the aphis, but certain species have 
been known to care for their eggs and colonize them on roots in their under- 
ground galleries, and I have myself seen ants in regular procession carry 
aphis from the top of a walnut tree down to the ground. The ants greedily 
lick up the honey dew, and if not excreted fast enough, they will hasten it 
by pricking the aphis with their antennae. 

Another significant fact connected with aphis is the black smut, which is 
invariably present whenever honey dew from any of the aphis or scale is 
secreted. This is a true fungus (Fumago salicina) , Hying on this honey 
dew alone and not penetrating into the plant. If the aphis is removed, 
the smut will invariably cease to grow. 



Classification of the Coccid^. 

By Mon. V. Signoret, of Paris. 

I. Diaspides. — Species covered with a scale composed of successive moultings, and of a 
secretion forming a shield, or sack, more or less independent of the body of the animal. 
Kine genera are included in this sub-familj^, but the scales may all be reduced to two 
principal types, viz.: those with rounded shields, liive an oyster shell, with the larval scale 
in the center; and those with more lengthened shields, in the form of a large comma, or 
of a large mussel shell, and having the larval scale at one end. 

II. Brachyscelides. — Species living in gall-lilce, or tube-like, excrescences. These insects 
are, so far as known, confined to Australia. 

III. Lecam'des. — Species either naked or inclosed, or simply covered with waxy, calcare- 
ous, or filamentous secretions, and in which the female, after fecundation, generally 
acquires an entirely different form to that which she previously possessed, and becomes 

. fixed. Before pregnancy, they have the power to move, if necessary. A number of genera 
are included in this sub-family, some of which approach in some characters to the Diaspi- 
des, and have been separated by Targioni under the name of Lecanio diaspides. 

IV. C'occtrfes. —Species retaining to the end the body form, with all its joints distinct. 
They never become necessarilj^ fixed, and are either naked or more or less covered with 
waxy or spumous matter, arranged generally in filaments. 

In summing up the chief characteristics of the coccidse, I give Mr. Mas- 
kell's words: 

The first principal character separating the coccidse from other Homoptera, and distin- 
guishable without microscopic examination, is the absence of wings in the female in all 
stages of their existence. 

The second principal character is the absence of any apparatus for feeding and digesting 
in the viale. 

From these two characters it follows that the females can only extend their operations 
by, at the best, crawling from plant to plant, or by being carried by birds, or other agen- 
cies. Also that the males cannot enjoy more than a very short existence, their work being 
entirely confined to impregnating the females. Hence, in an endeavor to destroj' these 
insects, the males may be disregarded, and the females attended to. 


Aspidiotus Perniciosus. (Figure No. 2.) (Comstock.) 

This is one of the worst and to-day the most widespread of the species 
of scales which are found preying on deciduous fruit trees in California. 
The work of this species is generally readil}^ distinguished from other spe- 

Figure No. 2. 

Descnplion.— Scale, about one sixteenth of an inch in diameter (scale of male insect 
elongated); color, center, yellow; margin, dark-mottled gray; eggs, thirty to fifty pro- 
duced by each female; color, yellow; form, ovate; larva, six legs; two antenna?, six- 
jointed; two analsetse; body, color, yellow; form, oval. Male insect (perfect), winged- 
wings nearly transparent; body, color light amber, with dark-brownish markings: anten- 
nae, ten-jointed (hairy), and stylet nearly as long as body. 


cies of scale by the red blotches which are formed wherever it stings any 
part of the tree — either branch, leaf, or fruit. These red blotches are more 
pronounced in some varieties than in others. When the scales are present 
in large numbers it causes a complete discoloration of the bark clear to the 
sapwood. This scale, like others, has its preference among the deciduous 
fruits, which it affects most severely. The apricot is the only one which, 
it may be said, is proof against it; certain varieties of cherries and plums 
are but little aff"ected, the reason being, probably, that the bark is too com- 
pact for the scale to pierce it with its proboscis. 

Plate I shows the appearance of the insect and its work on fruit, leaf, 
and branch. 


It is generally accepted as a correct statenient that this insect has three distinct broods; 
one in June, one in August, and one in October, at which times all the scale eggs are 
supposed to hatch. As might be expected, the time for these hatchings varies somewhat, 
according to climate and locality, a warm location hastening the development. But what 
is of more importance is, that all the insects evidently do not hatch out at once. During 
most of the time of the growing season there can be found young insects crawling around, 
though certainly at the periods stated they are most numerous. Yet, enough will linger 
along between every two of these periods to prevent summer washings to be thorough 
remedies, as the old scales are too well protected to be killed by anything that can be 
applied in the summer. I believe this is the reason why persons have been so unsuccess- 
ful in their treatment against these insects, and hence' I am of the opinion that winter 
treatment, when we can apply remedies strong enough to kill the protected insects, is the 
best time to accomplish the desired result. One most important point to be considered in 
spraying is the size of the tree. While it is a comparatively easy thing to reach every part 
of a small tree, a large tree, particularly one with rough Isark, it is almost impossible to 
cover with the spray. 


Aspidiotus Rapax. (Comstock.) 

This species (Figure No. 3) aff'ects many kinds of trees, deciduous as 
well as evergreens. It is easily confounded with a' closely allied species, 
Aspidiotus convexus. This was probably imported. 

Description. — Scale, about one sixteenth of an inch in length; 
form, ovoid; color, drab; larva, less than one hundredth of an inch 
in length; two antennae, six-jointed; two anal setae. Female, bright 
yellow. Male, winged. This insect is found in many places along 
the coast. It infests, chiefly, pear trees, hence its name. It is dis- 
tinguishable easily from the Aspidiotus perniciosus by its whitish-yel- 
low color, contrasting with the dark color of the latter. And another 
point of difference: the white pear scale leaves no special mark 
where it has been, while the Aspidiotus perniciosus almost invariably 
is followed by red marks. 

Generally, this scale has only one brood in the season, but I have 
found them breeding on pears in the storehouse during the winter. 
As compared with the pernicious scale, it is of little danger, owing 
iiigureNo. 3. to its slow breeding propensities. 

Aspidiotus convexus resembles this form closely in habit and outward 
appearance. It is slightly more convex, and is best distinguished by 
microscopic characters. 



Aspidioius Conchiformis (Gmelin). 
Mytalaspis Pomicorticis (Riley). 

Figure Xo. 4. 

This is one of the few insects which the Northeastern States have in 
common with us. Like the preceding one, it has only one brood during the 
season. It affects the apple chiefly, although sometimes the pear, also. It 
is confined chiefly to the coast counties, but is also found in other places, 
as San Joaquin Valley. Owing to the thickness of the armor, it is one of 
the most difficult of the scales to exterminate. 

Description of Figure Xo. 4: 1. Egg; 2. Young insect (larva) ; 3. Appear- 
ance of secretion as it hardens and forms shell over body of insect; 4. A 
form of the scale before it reaches maturity; 5 and 6. Appearance of insect 
after casting skin, limbs, and other appendages; 7. Scales (cover) at ma- 
turity; 8. Antennae. All of these figures highly magnified. Description 
of insect, etc.: Eggs, number under each scale, thirty to seventy-five; 
length, one one hundredth of an inch; form, irregularly ovoid; color, snow 
white, when near hatching, yellowish. Larva: Length of body, one one 
hundredth of an inch; form, ovoid, three times as long as wide: color, pale 
yellow. Antennae, sometimes six-jointed, but generally seven-jointed. Anal 
setse, two, about two thirds as long as body. Male insect (perfect) : Length, 
one forty-fifth of an inch; color, flesh-colored gray; abdomen and thorax, 
about same length as seen from above; wings, nearly transparent. "The 
last joint of abdomen narrowed into a large tubercle bearing four bristles 
on the under side, and sending forth the genital armor in the form of an 
awl-shaped stylet as long as abdomen." 

Remedies. — For a number of years I have tried to find an effective remedy 
against this scale. I have tried concentrated lye, one pound to the gallon, 
with the effect of damaging the trees. Finally, one half pound of lye and 
one half pound commercial potash to one gallon water was used last winter, 
and applied to the orchards on the experimental grounds of the University. 
The success was very marked. No damage was done to any but a few trees 
that had started prematurely. With various summer washes on this scale, 
I accomplished but little good. 



Diaspis Rosse. (Sandberg.) 

Fisiii'L- Xo. 5. 

The rose scale is easily recognized from the other more common scales 
by its giving the parts aflected a white, almost mildewy-like, appearance. 
This is due to the massing together of the scales, which are pure white, 
very thin, and like paper. (Figure No. 5.) 

The scale of the female is circular, snowy white (or according to Signoret, 
yellowish white), with the exuviae, light yellow, and upon one side; the 
first skin is naked, the second usually covered with secretions. Female is 
elongated, resembling a mytilaspis more than a diaspis. The head and 
thorax comprise the larger part of the body. The abdomen is very dis- 
tinctly segmented, especially on the sides. Scale of the male resembles 
that of other species of diaspis, in being, long tricarinated, and white, with 
the larval skin at the end. The male is of a reddish white, with the wings 
white, the veins of the wings rosy. The venta is a little darker. The style 
equals the abdomen in length; antennee and feet yellowish, slightly pub- 
escent. (Signoret.) The rose scale infests, besides roses, various fruit 
bushes, especially blackberries and raspberries. 

Remedy. — For raspberries and blackberries the cutting down of the canes 
to the ground should be adopted, and the stumps sprayed or washed with 
one of the solutions recommended under the head of general remedies for 
scale insects. 


OLEANDER SCALE. (Figure No. 6.) 
Aspidiotus Nerii (Bouche). 

Figure No. 6. 
i.— Leaves and twigs infested with the scale. 1 a.— The male insect greatly magnified ; 
color, yellow and brown. 1 b. — Scale of male very enlarged ; color, white. 1 c. — Scale of 
female highly magnified; color, whitish or gray. 

The female is of a whitish color and nearly circular; measures one line 
in diameter; exuviae, or cast skin, yellowish and near the center. Male 
scale white and not as circular as that of the female; egg, light yellow; 
larva, yellowish white; length, one eighty-fifth of an inch. Female, light 
yellow with darker blotches; abdominal segments appear as a pointed pro- 
jection at one end of the circle. Male insect, body yellowish with dark 

This scale affects a great many trees, especially evergreens. Lemon trees 
become badly affected by it and the fruit is somtimes completely covered 
with it. Among others the olive is also subject to it, and we have seen trees 
badly infested with the insect. The fruit of the olive when infested does 
not mature well, and wherever a scale is found a green blotch shows its 
appearance. As this is the only scale affecting the olive in the dry interior 
valleys, it is important that it should be guarded against. 


RED ORANGE SCALE. (Figure No. 7.) 

Aspidiotus Aurantii (Maskell). 

The following description is taken from the report of the late Mr. M. 
Cooke to the Board (see report of 1881). 


Scale, matured, one twelfth of an inch in diameter (in a few cases it exceeds this); 
color, center, yellow, margin, light brown; eggs, from twenty to forty under each scale; 
form, ovoid; color, bright yellow; antennae, six-jointed. Female insect: color, yellow. 
Male insect (perfect), winged, about one forty-fifth of an inch in length; wings clear, 
nearly transparent; color of body, amber yellow, with slight dark markings; anal stylet 
appendage nearly as long as body. 

In some parts of Los Angeles County, also in Sacramento City and about Marysville, a 
distinct variety of red orange scale is found. According to the best authority, it cannot 
be considered specifically distinct from the Aspidiotus aurcmtii, yet its appearance and 
manner of attack are so different that I have thought it worthy of a special plate. The 
difference of opinion in Los Angeles County as regards the efficacy of certain remedies, 
and also as regards the more or less dangerous character of the red scale, is doubtless 
due to the fact of the two varieties being confounded. Of the two the first named or true 
type must be regarded as the most dangerous. The appearance of trees infested with 
this pest is very striking, very much resembling those diseased from other causes, such 
as bad drainage, the leaf representing a mottled appearance, a light blotch around the 
scale contrasting with the natural green of the leaf. The branches are but little troubled, 
but the fruit, like the leaf, becomes completely covered with the insects. An orange tree 
infested with this scale gradually becomes sickly and languishes, though I have never 
seen any that were actually killed by this scale. 

Figure No. 7. 

The chief difference between these two varieties, if they are not to be 
called species, is that of color, the latter being of a much paler yellow 
than the true type. Trees imported from Japan are often infested with 
this form, and the probability is that it was imported from that country, 
while the other, or true form, came from Australia. Where this variety 
is it is very destructive. Plates II and III show the appearance and 
characteristic work of these two forms. 


BLACK SCALE. (Figure No. 8.) 

Lecanium Olea (Bernard). 

Figure No. 8. 

Description. — Dark brown, nearly black, in color; heniispberical in form, often 
however, a little longer than broad ; average length, from 4 mm. to 5 mm. ; average height 
3 mm.; dorsum, the latter dividing the body into three subequal portions (frequently the 
longitudinal ridge is more prominent between the transverse ridges than elsewnere, there 
forming with them a raised surface of the shape of a capital H). The bodj^ is slightly 
margined, the outer jiart of the disc, with many, having eighteen to twenty small ridges, 
which extend from the margin half way up the center of the dorsum. The antennro are 
long and eight-jointed, the two basal joints short, joint three longest, joints four and five 
equal and shorter, joints six and seven equal and still shorter, joint eight with a notched 
margin and almost as long as joint three; legs, rather long and stout, the tibia being about 
one fifth longer than the tarsi; egg, long and oval in shape, .04 mm. in length, yellowish in 

Newly-Hatched Larvx. — There is nothing very characteristic about these. They are flat 
and their antennae six-jointed. 

Treatise on injurious jnd beneficial Insects bu 11/. G. Klee. 


'l\ ^' 


±\spiaiDius i-ernlclD3Us (Comstnck.) 

Treatise an iniarious and henef.cia! Insects by lU . D. Klee. 

Bt^' = 

fispldlotus Aarantl 
RED ORftNGE SCALE (JapanssR Type.) 

Tm^lise an Jniurious and heneficial Insects by lU . G. Klse. 


Lith. BTiitDtt & Rrij. 5. F, 

Aspldiatus fiurantl (Maskell.) 

Treatise nn injariaus and lieneficia! Insects by lU. D. Klae. 



.f -r 

Lith. Brlttnn 

loerya Purchasl (Maskell.) 


The black scale infests deciduous trees as well as evergreens, and is 
especially troublesome on the olive. During the winter they may easily 
be destroyed by the same washes recommended for the pernicious scale, 
half the strength being sufficient. On the olive it is much harder to kill, 
and so far I have not succeeded in finding anything that would kill 
nearly grown insects without damage to the tree. Kerosene emulsions 
have been made largely with Mr. E. Cooper, but his recent experience 
warrants great care in the selection of oil. Personally, I favor the sul- 
phide of soda soap recommended for scale insects generally. 

Parasites often destroy 50 per cent of this scale, especially the Tomacera 
californica. Drying winds are also a great check on their spread. 

SOFT ORANGE SCALE. (Figure No. 9.) 

Lecanium Hesperidum (Linn). 
Probably imported from the Mediterranean. 

Figure No. 0. 

Description of Scale and Insect.— Sci\\c, ovoid, a little wider at one end than at the other; 
length, from one twelfth to one seventh of an inch ; color, dark brown on convex part, and 
a lighter brown surrounding margin; it has two indentations on each side, and one on 
posterior end; eggs from seventy-five to one hundred and twenty-five under each scale. 
Larva, length about one ninetieth part of an inch; color, yellowish, slightly mottled; 
seven-jointed anteimse; two anal seta3 as long as body. The viscera can be readily.seen 
through the scales while maturing; color of viscera, yellowish red; male, winged. 


This species of scale is found in many of the orange growing sections, 
where it infests lemons and oranges alike; although the individual insects 
are easily killed, the manner in which they cling together makes it more 
difficult. In Los Angeles, where the scale insect proved so very formidable, 
at one time so destructive that, according to Alexander Craw, Mr. Wolf- 
skill threatened to abandon orange growing. It does not now trouble the 
trees much, owing to the presence of two parasites, which have nearly 
destroyed it altogether. It is found sparingly in the foothills of the Sierra 
Nevada, but does not seem to gain much headway. 

COTTONY GRAPE SCALE. (Figure No. 10.) 

Lecanium Vitis. 

This scale infests grapevines, and from the cottony excretions which so 
abundantly surrounds its eggs, has been called the cottony grape scale. 
It has more than once been confounded with the dreaded Icerya purchasi, 
from which it is most easily distinguished, the body of the latter being soft 

Figure No. 10. 

and fleshy, while the grape scale is horny, like most all lecaniums in 
mature state. This insect does not seem to increase, and has never been 
very troublesome. A gentleman of San Diego has lately made the obser- 
vation that it is attacked by a native species of ant. Probably this is the 
check that prevents their increase. 

FILBERT SCALE. (Figure No. 11.) 

Lecanium Hemisphericum. 

The late Matthew Cooke has in his work on injurious insects a scale 
insect called the " filbert scale," which is found on various trees, but in my 
opinion originally spread from the live oak. So far I am not aware that it 
has proved anything formidable; it would doubtless yield to the same 
remedies used for the black scale. 


I copy this description from Mr. Cooke's book: 

Eggs: Length, one eighty-tifth of an inch; width, one half; color, pinkisli; from seventy 
to one hundred laid by each female. Larva: color, reddish; length, one seventy-fifth of 
an inch. Antennae : Seven-jointed, anal seta present. The females have the power of loco- 
motion for some time. When young, they are of a reddish color, changing to a light 
brown, finally becoming dark brown when they reach maturity. From the common black 
scale they are easily distinguished by the absence of the ridge in their back — the shape of 
the letter H. 


Lecanium Species. 

This species has to my knowledge not been described, and specimens 
were forwarded some time ago to an eastern gentleman making this group 
a specialty, but nothing has been heard from him. As it has been spread- 
ing lately in the prune districts of Santa Clara, I shall attempt to de- 
scribe it in such a way that it will be recognized. 

In general appearance this lecanium is very similar to the soft orange 
scale, with which it has been confounded. Its most striking difference is 
this: The L. Hesperidum is viviparous, that is the young come forth from 
the adult direct, and eggs are not seen. In this case the eggs are a very 
conspicuous feature. They are present in immense numbers, and the 
empty egg cases remain under the scale. They are surrounded with a 
mealy powder, and this often adheres to the branch, leaving a white mark 
the shape of the scale. The scale is boat shaped, when reaching maturity 
somewhat wrinkled; the color is a shiny brown, darker in the center, 
lighter at the edges. A full large-sized scale has a length of a quarter of 


an inch, and a width of one eighth of an inch. The eggs generally hatch 
in May and June (this season in June), and the main brood is produced in 
a few weeks. The young are similar in shape to the L. olex, but very 
transparent; they are quite active and scatter all over the leaves and 
young branches, causing an enormous exudation of honey dew, which 
invites the black fungus (Fumago salicina), and has a very serious influ- 
ence on the development of the fruit. The young do not increase much in 
size the first season, but with the rise of sap in the trees in spring aug- 
ment rapidly in size, and in April and May cover the branches, appearing 
as bead-like projections along the branches. There is evidently only one 
brood in the year. 

This scale attacks nearly all kinds of deciduous fruits, but seems to be 
especially adapted to the prune and apricot. 

I have not observed any parasites on the scale, but have been told of 
signs of such. 

As it is one of the few scales attacking the apricot I have given it the 
name of the brown apricot scale; some person in Santa Clara has called it 
the mealy scale. 

For remedies see general remedies for scale insects. 


Icerya Purchasi (Maskell). 

Fluted Scale (Professor Riley). 

Cottony Cushion Scale (California). 

Australian Bug (Cape Town, Africa). 

Under these various names is this, one of the veritable pests to orange 
growing, known in different sections. It would be advisable to reduce all 
the names to one, and I favor the name of fluted scale, proposed by Pro- 
fessor Riley. Suffice it to say, that this insect has existed in San Mateo 
County since 1868, whence it is supposed to have come from Australia. It 
is now found in a number of counties and steadily spreading. 

Description. — Plate IV will give the reader a good general idea of the 
fluted scale. Figure 1 represents a branch of Japanese orange, natural 
size, covered with the insect in its various stages. Figure 2 represents a 
full grown female, much enlarged, with the egg sack laid open, showing 
eggs and young insects just hatched. Figure 3 represents a full grown 
female larva, enlarged. 

The following detailed scientific description is borrowed from Professor 
C. V. Riley's report: 

The Egg (Figure 12). — The egg is quite smooth, elongate-ovate in form, and is of a deep 
orange-yellow color. It measures about 0.7 mm. in length. 

The average number of eggs laid by the female varies according to the vigor of the indi- 
vidual or the condition of the plant upon which she dwells, prolificacy diminishing in 
proportion as the plant is badly infested— a general law among coccidse. Over eight hun- 
dred eggs have been counted in a single egg mass by Mr. Coquillett, while Mr. Koebele has 
counted in a single egg mass, which, by the way, was found upon nettle ( Urtica holosericea), 
nine hundred and forty eggs and seventy-two young larv^ , while one hundred and twenty- 
three eggs yet remained in the dead body of the female, making a total of one thousand 
one hundred and tliirty-five eggs from the single female. 

The time required for the eggs to hatch after leaving the body of the female varies with 
the temperature. In the winter time the sacs are usually filled with eggs, while in the 
hottest part of the summer seldom more than one or two clozen will be found in each sac. 
Some collected by Mr. Coquillett on the eighteenth of March did not hatch until the tenth 
of May, but in midsummer hatching is only a matter of a few days. 


The Female Larva— First Stage (Figure 13). — The newly hatched female larva (and 
probably the male is identical with it at this stage of growth, since we have not been able 
to separate them into males and females) is red in color, inclining somewhat to brown. 
The body is ovoid in outline, being flatttened beneath and convex above. The antennae are 
long and" six-jointed. Joint one is short and stout, and as broad as long; joints two, three, 
four, and five, subcylindrical and subequal, much more slender than joint one, and twice 
as long as broad ; joint six is as long as four and five together, and forms a long club, at 
base equaling joint five in diameter, but broadening out to twice its width at tip. The 
basal portion of the club is sometimes distinctly sejiarate from the rest, forming an addi- 
tional joint. All joints have a few sparse hairs, and the club, in addition to several short 
ones, bears near its tip four very long ones, each of which is considerably longer than the 
whole antenna. The legs are thin and brown in color. The coxae and femora are moder- 
ately large, while the tibiae and tarsi are long and thin, the terminal jciints of the latter 

Figure No. 12. 

Figure No. 13. 

Figure No. 14. 

Figure No. 15. 

Figure No. 16. Figure No. 17. 

Female Icerya, from Egg to Adult Form. 

bearing several long hairs. The upper digitules are represented by simple hairs, but the 
lower ones are present and are bent near the base. The eyes are prominent and are each 
mounted on a short tubercle. The mentum is broad and apparently two-jointed. The 
rostrum is broad at base and the rostral setae are not very long. At the tip of the rounded 


abdomen are six small tubercles, three each side of tip, each of which carries a long, stout 
hair, which is as long as the whole body. The body above shows six rows of secretory 
pores, four along the middle and one on each side. More or less regular rows of hairs 
alternate with these pores. 

Female Larva — Second Stage. — According to Maskell and Comstock, there are but three 
stages of growth in the female after hatching, and these are readily distinguished by the 
number of antennal joints; the larva of the first stage having six, that of the second nine, 
and the adult eleven. Messrs. Coquillet and Koebele came to the same conclusions, and 
all have overlooked a form which we have found quite abundantly among the material we 
have studied, and which seems to constitute an intermediate stage between the so called 
first and second, and which is, of course, produced by an additional molt which we have 
personally observed in the field. Hence the so called "second stage" of these authors be- 
comes third, while the adult female is fourth instead of third, and there are three molts 
instead of two. 

This new intermediate form (Figure 14) differs from the female larva of the first stage in 
the following respects: It is much more rounded and of a stouter general appearance. 
The antennse have the same number of joints, six, but their relative proportions are quite 
difTerent. The antennae, as a whole, are relatively much shorter. Joint one is short and 
stout, its length equaling its breadth ; joint two equals joint one in length, but is not quite 
so broad; joint three is as broad as joint two, but is twice as long; joints four and five are 
equal in length and width, each narrowing somewhat at base and tip, each considerably 
narrower than joint three, and each of the same length as joint two; joint six (club) is of 
an irregular shape — at base it is as narrow as joint five, but it broadens until it is slightly 
wider than two or three, and its tip is narrowed again; its shape is that of an irregular 
rhomboid, with rounded angles and sides, the acutest angles at base and tip. The anten- 
nse carry about the same number of hairs as in the first stage, but those homologous with 
the four very long hairs of the club in that stage are in the second stage but little longer 
than the other antennal hairs. The eyes do not appear on the margin of the body, and 
are only seen on a ventral view. The legs are proportionately much shorter, and the 
femora "are stouter; the trochanters are broader distally, and consequently form a broader 
triangle in shape. The six tubercles at the anal end of the body are still present; but the 
hairs which they bear are much shorter. The secretory pores are no longer arranged in 
rows, but are scattered sparsely over the back and under the sides. The back is more 
hairy, and the short black hairs occur in irregular tufts. 

Female Larva — Third Stage (Figure 15). — That which has heretofore been considered the 
second stage, and which, as we have just seen, is the third, may be described as follows: 

The body is broadly oval in shape, and reddish brown in color, but is soon obscured 
more or less bj' the "thick, curly, cotton-like excretion. The antenntie are nine-jointed 
instead of six, and are subcylindrical, tapering somewhat from base to tip. .Joints four, 
five .six, seven, and eight are subequal in length, and each is about as long as broad ; joints 
two and three are broader and considerably longer; joint one is like the corresponding 
joint in the previous stage; joint nine (club) is a suboval joint, proportionately much 
smaller than in the previous stages; it does not exceed joint eight in width, and it does 
not equal joints seven and eight together in length. The long hairs of the club are pro- 
portionately quite short. The insect, as a whole, is much more hairy than in either of the 
previous stages. The hairs are short and black, and show a marked tendency to grow 
together in tufts; even when their bases are well separated, their tips turn toward each 
other, or toward the common center of a group; they are quite thickly scattered over the 
thorax, but less so over the abdomen ; all around the edge of the body they appear in close 
tufts, and the concentric subdorsal ring of tufts which is so prominent in the next stage 
is plainly seen in this. The secretory pores are scattered irregularly all over the back, and 
are more numerous than in the previous stage; they also occur under the lateral edges of 
the body. They are small and circular, and seen directly from above have a double out- 
line, indicating a circular central orifice. Around the edge of the body is a row of much 
larger pores, brown in color, which protrude from the bod}^, masked by the lateral tufts of 
hairs, each with a circular crown or lip at tip, from which proceeds a long, fragile, glassy 
tube. (Figure 16.) The legs and feet are a little stouter than before, the tarsal digitules 
are shorter, and their enlarged tips quite indistinct. The six anal hairs are still present, 
though hardly noticeable as they protrude from the mass of shorter hairs. 

The Adult Female — Fourth Stage (Figure 17). — Immediately after the molt by which the 
insect passes into this stage, it is free from the waxj^ excretion, and presents a broad, oval 
form, flattened below and quite strongl.y convex above, with two prominent raised surfaces 
on the second and third thoracic segments. Its color is still reddish brown, with several 
darker spots, especially ujion the front half and along the sides of the posterior half of the 
body, and the antennse and legs are black. The antennse are now eleven-jointed instead of 
nine ; joint one is nearly twice as wide as long ; joints two and three are subequal in length 
and thickness, and are each somewhat longer than broad; joint four is a little more than 
half as long as three, and is narrower; joints five, six, seven, eight, nine, and ten increase 
gradually and slightly in length, and decrease verv slightly in width ; joint eleven (club) is 
irregularly ovoid, and is one and a half times as long as ten ; the special hairs are a little 
shorter than in the previous stage. The whole body is furnished with short, black hairs, 
more numerous than in the last stage, arranged in tufts, particularly around the edge, 
where they occur in a double parallel row, the inner row being practically subdorsal and 
accentuated by a slight ridge. Down the central portion of the dorsum of the abdomen 
the segments are indicated by the transverse rows of hair tufts. The secretory pores are 

exceedingly abundant, occurring in enormous numbers just under the lateral edges of the 
body, and scattered more sparsely over the back. The individual wax filaments which 
issue from these pores are verj' delicate and curly, and there is reason to suppose that 
two or three issue at one time from one pore, as they are frequently seen connected at 
base; the pore opening, however, seems to have a single simple opening. The inner row 
of tufts on the back is broken at its anal point by a depression, in which is situated a very 
large pore, from which the insect occasionally ejects a globule of a semi-liquid honej'-dew. 
This depression is surrounded by an irregular ring of hairs, which are yellowish in color 
instead of black. The glassy filaments arising from the large tubular pores described in 
the last stage are now very long, and radiate from the body in almost every direction. 
They break off easily, yet still often reach a length double that of the insect and her egg- 
sac together. What is probably the opening of the oviduct is situated on the under side 
of the seventh abdominal segment. It is surrounded by a transversely oval chitinous 

The Egg-Sac— As the body of the female begins to swell from the eggs forming inside, 
the beginning of the egg-sac is made. The female lies flat on the bark, the edges of the 
bod}' turned slightly upward, and the waxy material of which the sac is composed begins 
to issue from countless pores on the under side of the body, but more especially along the 
sides below. As the secretion advances the body is raised, the cephalic end being still 
attached, until, near the completion of the sac, the insect is, apparently, standing on its 
head, nearly at right angles to the surface to which it is attached. The egg-laying com- 
mences as soon as a thin hiyer of the secretion has formed on the under side of the ab- 
domen, and it continues during the formation of the sac. There soon appears around the 
edge of the abdomen a narrow ring of white felt-like wax, which is divided into a number 
of flutings. These flutings grow in length, and the mass of eggs and wax under them 
increases, forcing the female upward until the sac is completed. When completed, it is 
from two to two and one half times the length of the female's body. It is of snow white 
color, and the outside is covered with fifteen of these longitudinal ridges, or flutings, of 
subequal size, except that the middle one is smaller than the others. The upper part of 
the sac is firm in texture, but the lower is looser and thinner, and from the middle of the 
under side the young make their escape soon after hatching. The size of the sac and the 
length of time required in its growth depends, leaving the weather and the health of the 
food-plant out of consideration, upon the number of eggs which the female deposits. So 
long as oviposition continues, the secretion of wax accompanies it, and the egg mass 
grows. Concerning the rate of growth, Mr. Coquillett gives the following instance: 

" On the fourth of May of the jjresent season I marked a large number of females which 
were located upon the trunk of an orange tree that was not in a very healthy condition. 
These females had just begun to secrete the cottony matter, the latter at this date being 
in the form of short but broad tufts around the margin of the abdomen, those at the hind 
end of the latter being longest. By the thirty-first of May the cottony matter was equal 
in length to one third of the female's body, and by the middle of July it about equaled 
in length the entire body of the female. As the egg-masses of some of the females upon 
the same tree were longer by one half than the bodies of the females which produced 
them, it is very probable that at least another month must elapse before the egg-masses 
of the females which 1 observed would be completed. It is altogether likely, however, 
that these egg-masses would have been completed in a shorter time had the females been 
located upon a healthy tree. The egg-masses found upon healthy trees attain larger size 
than those found upon sickly trees, owing, doubtless, to the fact that the females living 
upon trees of the former kind are more vigorous than those upon unhealthy trees." 

The Male Larva— Probable Second Stage.— 'S either Mr. Coquillett nor Mr. Koebele were 
able to distinguish the male larvse iintil these had reached the stage in which they form 
their cocoons. Among the specimens studied at the Department, and which were sent 
alive from Los Angeles by Mr. Koebele, we have found a larval form which has not yet 
been described, and which we strongly suspect may be the male in the second stage. 
This form is illustrated at Figure 18. 'It differs from our supposed second stage of the 
female in its more slender form, longer and stouter legs, and longer and stouter antennae. 
The legs and antenna; are not only relatively longer and stouter, 1)ut are absolutely so. 
The body above is much more thickly clothed with the short stout hairs than the corre- 
sponding female stage, and the mentlim is longer and darker colored. The antennae are 
six-jointed, and the joints have precisely the same strange relative proportions as in the 
female. The secretory pores are present, but not quite so numerous as in the female. 

3fale Larva— Third Stage.— In this, the third or last larval stage, the male is readily dis- 
tinguished with the naked eye from the female in any stage by the narrower, more 
elongate, more flattened, and "evenlv convex form of his body, as well as by his greater 
activity in crawling about the trunk or branches of a tree. More careful examination 
shows that the beak is entirely wanting, the tubercle from which it arises in the earher 
stages being replaced by a shallow triangular depression. The body is almost naked, 
being very sparsely covered with a short, white, cottony matter, and is destitute of the 
short but stout black hairs which are found upon the body of the female during the third 
and fourth stages of her life. In the absence of black spots and in the lune-jonited 
antennae, he agrees with the similar or third stage of the female, and the average length 
when full grown is about 3 mm. and diameter about 1 mm. 

The Male Piqm and Cocoon.— When the male larva has reached full growth and is ready 
to transform, it wanders about in search of a place of concealment, finally secreting itself 
under a bit of projecting bark, under some leaves in the crotch of a tree, or even wedg- 


ing itself down under a mass of females. Very frequently, probably in the majority of 
cases, it descends to the ground and hides under a clod of earth, or works its way into 
some crack in the ground. Having concealed itself, it becomes quiescent, and the deli- 
cate, flossy substance of which the cocoon is formed begins to exude abundantly from 
the body. This material is waxy in its character, but is lighter and more flossy, and less 
adhesive than that of which the egg-sac of the female is composed. After a certain 
amount has been exuded, the larva moves backward very slowly, the exudation continu- 
ing until the mass is from 7 mm. to 10 mm. in length. From this method of retrogres- 
sion it happens that the body of the larva is frequently seen protruding posteriorly from 
the mass, which naturally leads to the erroneous conclusion that the material is secreted 
more abundantly from the fore part of the body, whereas the reverse is the case. When the 
mass has reached the proper length the larva casts its skin, which remains in the hind 
end of the cocoon, and pushes itself forward into the middle of the cocoon. 

Figure No. 18. 

Figure No. 19. 

The pupa (Figure 19) has the same general color as the larva, the antennae, legs, and 
wing-pads being paler and the eyes dark. It has also the same general form and size. 
All the members are free and slightly movable, so that they vary in position, though or- 
dinarily the antennae are pressed close to the side, reaching to basal part of metathorax 
(ventrally); the wing-pads also against the side, elongate-ovate in form and reaching the 
second abdominal joint. The legs are rather shorter than the diameter of the body, and 
the front pair thrust forward. The anal end is deeply excavated, the abdominal joints 
well separated, tlie mesonotum well developed, and the pronotum tuberculous are with 
some eight prominences; but there are no other structural peculiarities. The surface is, 
however, more or less thickly covered with waxy filaments, which are sometimes exuded 
in sufficient quantities to give quite a mealy appearance. 

Whenever the pupifi are taken from the cocoon and placed naked in a tin box, they 
exude a certain amount of wax, often enough to partially hide them from view. If dis- 
turbed, they twist and bend their bodies quite vigorously. 

The cocoon is of an irregular, elongate shape, appearing a little denser in the center 
where the pupa has placed itself, and at the edges delicate and translucent. The material 
of which the cocoon is composed is very delicate, and appears like the finest cotton, but 
on submission to a gentle heat it melts as readily as the coarser secretion of the female, 
and leaves the larva or pupa, as the case may be, clean and exposed. 

The Adult Male (Figure 20).— The following detailed description is drawn up from nu- 
merous specimens both mounted and living: 


"The adult male is a trifle over 3 mm. in length, and has an average wing expanse of 7.5 
mm. The general color is orange red. The head above is triangular in shape, with the 
apex blunt and projecting forward between the bases of the antenna;. The eyes are placed 
at the other apices of the triangle, and are lai-ge, prominent, and furnished witli well 
marked facets. There are no mouth parts, but on the under side of the head is a stellate 
black spot with five prongs, one projecting forward on the conical lengthening of the head, 
one on each side to a point just anterior to the eyes and just posterior to the bases of the 
antenna;, and the remaining two extending laterally backward behind the eyes. The 
antennie are light brown in color, and are composed of ten joints. Joint one is stout, 
almost globular, and nearly as broad as long; joint two is half as broad as one, and is 
somewhat longer; joint three is nearly twice as long as one, and slightlj^ narrower than 
two; joints four, five, six, seven, eight, nine, and ten are all of about the same length as 
joint three, and grow successively a little more slender; each joint, except joint one, is 
furnished with two whorls of long light-brown hairs, one near base and the other near 
tip; each joint is somewhat constricted between its two whorls, joint two less so than the 
others. There are no visible ocelli. The pronotum has two wavy subdorsal longitudinal 
black lines, and the mesonotum is nearly all black, except aiji oval patch on the scutum. 
The metanotal spiracles are black, and there is a transverse crescent-shaped black mark, 
with a short median backward prolongation. The mesosternum is black. The legs are 
also nearl.y black and quite thickly furnished with short hairs. The wings are smoky 
black, and are covered with rounded wavy elevations, making a reticvdate surface, a cross 
section of which would appear crenulate. The costa is thick and brown above the sub- 
costal vein, which reaches costa at a trifle more than four fifths the length of the wing. 
The only other vein (the median) is given off at about one sixth the length of the wing, 
and extends out into the disk a little more than one half the wing length. There are, in 
addition, two white lines, one extending out from the fork of the subcostal and the median 
nearly straight to the tip of the wing, and one from the base in a gradual curve to a point 
some distance below the tip. Near the base of the wing below is a snudl ear-shaped pro- 
longation, folded slightly on itself, making a sort of pocket. The halteres are foliate, and 
furnished at tips with two hooks, which fit into the folded projection at base of wings. 
The abdomen is slightly hairy, with the joints well marked, and is furnished at tip with 
two strong projections, each of which bears at tip four long hairs and a few shorter ones. 
"When the insect is at rest the wings lie flat upon the back." 

Rate of Growth of the Different Stages. 

The rate of growth of theinsect necessarily depends so much upon surrounding condi- 
tions, and especially on theTmean temperature, that it is difficult to make any definite 
statements as to tiine elapsing between molts or that required for other periods of the 
insect's growth. No facts have hitherto been published which bear upon this point. Mr. 
Coquillett's observations show that individuals hatched from eggs on the fourth of March 
cast the first skin on the twenty-third of April, and underwent the last molt on the twenty- 
third of May.— Mr. Koebele also reports a case which bears upon this point, and which is 
interesting as occurring later in the season. He placed four newly hatched larvae on a 
healthy young orange tree, out of doors, August fifth. On September twenty-sixth two 
of them passed through the first molt. October tenth one more molted, and on October 



twenty-third the fourth cast its first skin. All left the leaves after molting and settled on 
young twigs. None of them had gone through the last molt when he left Los Angeles, 
November sixth. He was afterwards informed by Mr. Alexander Craw, of Los Angeles, 
that nearly all of the insects were full grown in February, and he therefore concluded that 
the individuals observed by him would not attain full growth before that time. 

The mature male larva requires on an average about ten days from the time it begins to 
form the cocoon before assuming the pupa state, and the piipa state lasts from two to 
three weeks. The more reliable information we have been able to obtain would show that 
at Los Angeles the average number of generations each year is three. 


The fluted scale infests chiefly evergreen trees and seems to have an 
especial liking for Australian plants, notably the acacia tribe, which on 
account of this insect, in many sections of the State, has been replaced by 
other trees. Of fruit trees, the orange family is especially subject to its 
attacks, and its ravages in this country, as well as in South Africa, have 
been very severe. But although there exist many plants which are but 
little affected by this scale, there are scarcely any on which it may not 
find lodgment for some time until a better suited subject is found. Fall- 
ing to the ground they will exist on weeds and grass for some time, on 
some, such as nettles, thriving most wonderfully. It is this habit that has 
made this insect the most difficult to exterminate when well established. 


It is a singular fact that after an existence of some twenty years in this 
State, but few natural enemies have shown themselves. Under the head 
of " Beneficial Insects," I have recorded the Scymnu^ marginicollis as eating 
the eggs. In Professor Riley's report of 1886 I find the following underlines 
on this point: 

Neither Mr. Coquillett nor Mr. Koebele (his agents in California) have 
observed any birds feeding on the icerya. 

The only predaceous insects recorded by Mr. Coquillett to feed on it was 
the larva of a species of chrysopa, or lace winged fly. The ambiguous 
ladybug has been know^n to feed on the eggs when they were exposed to 

Among predaceous insects recorded by Mr. Koebele, and sent to me. is the 
larva of a small moth, which was found feeding on the dead larvae; if they 
could live on the living scale I had no proof. 

Two beetles, Blnstinus and Perimego.toma, were found among dead larvae; 
it is considered doubtful if they destroy living ones. 

The most efficient destroyer of the cottony cushion scale, at Los Angeles, is perhaps a 
species of earwig, family Forficnlidve, neither "the geniis nor species of which we are able to 
determine, from the fact that we have only seen immature specimens. According to Mr. 
Koebele, this insect is often met with among the scales, and, from observations which he 
made, feeds greedily upon the icerya in all the stages, tearing open the egg-masses and 
eating the eggs, and also tearing and eating the mature insects, as well as the larva\ The 
breeding habits of the mother earwig and her care of her iiock of young have been ob- 
served by Mr. Koebele, but have been so well studied by European authors as to need no 
detail here. 

Mr. Koebele also reports the occurrence in the scale masses, in large numbers, of a 
minute whitish mite, which becomes of a reddish color when full fed, and which he thinks 
destroys the female scales. We have not seen specimens of this naite, and are therefore 
unable to determine it. 

Parasites.— It is a somewhat remarkable fact that no true parasites were ever bred from 
the cottony cushion scale until the past summer, and still more remarkable that in the 
course of their careful investigations, extending over a space of six months, neither Mr. 
Coquillet nor Mr. Koebele succeeded in finding a single parasite tipon this insect. From 
a number of scales, however, sent to Washington by Mr. Koebele November tenth, we 
bred, on December eighth, two specimens of a small chalcid, which is, without question, a 


true parasite of icerya, as the female scales from which they escaped were foiind eacli 
with a small round hole in its back. 

This little parasite is prettily marked with black and yellow. It is new to our fauna, 
and may have been imported with its host. I turned it' over to Mr. Howard for study, 
and, as he finds it necessary to erect a new genus for it, I append his generic and specific 
characterizations : 

Isodromns n. g., Howard. 

Female. — The antennse near the border of the mouth; the scape is not widened; 
the pedicel is much longer than the first funicle joint; the funicle joints increase slightly in 
length from one to six and considerably in width, so that joint six is more than twice as 
wide as joint one; the club is half as long as the funicle and is obliquely truncate from 
base to tip. The head is thin antero-posteriorly; the facial impression is slight; the inner 
borders of the eyes (ire ncarli/ parallel; the ocelli are placed at the corners of a right-angled 
triangle. The scalpula' nifet on a long line at middle. The hind femora have a very deli- 
cate longitudinal furrow below. The marginal vein of the fore wings is entirely wanting; 
the stigmal is moderately long and bends abruptly downward, forming at first a right angle 
with the suhmarginal, afterwards curving slightly outwards ; the postmarginal is absent, the 
large mesopleura are covered with a number of longitudinal ridges. 

Male unknown. 

In Other Countries. — In Miss Ormerod's treatise on the icerya is found 
an account of a new species of lady-bug sent her by a correspondent in 
South Africa, Mr. S. Bairstow, of Port Elizabeth. This species resembles 
our chilecorus in markings, being a bluish black, with two red spots, but 
is hairy; it has been named Rodolia iceryx. Mr. Bairstow also sends a 
species of lace-wing fly, the larva of, which he has found in large numbers. 
In a letter received in December last from Mr. Bairstow by myself, he says: 
" Without doubt in this province last season rodolia and chrysopa worked 
miracles, which, though the human eye may not discover accurately after 
effect, reason may safely promise beneficial results." Mr. Bairstow in his 
letter promised to send me specimens of these insects at the first oppor- 

At the Santa Barbara Convention I read a small paper on the question 
of bringing parasites here, and the letters from Mr. Bairstow and ]\Ir. F. S. 
Crawford, of Adelaide, Australia, were published in full, to which the 
reader is referred. The second small consignment arrived here in June, 
they having been sent in the ice chest on the steamer " Zealandia " in special 
care of the purser. A large wire cage was made so as to inclose a bush 
four feet high. Here the infested bugs, a species of monophlebus*, were tied 
in a cloth to a branch of the tree — an English laurel. At the time of 
opening the box some of the flies had hatched, but were all dead. A 
visit three weeks after showed that no more had appeared. About two 
months after, however, I again visited the place and found, judging from 
the holes in the bugs (monophlebus), that from fifty to sixty flies had 

So far, therefore, the experiment, I believe, will prove a success if the 
parasite is as well adapted to live on the icerya as on the monophlebus. 
It is, of course, yet too early to know if any progeny has been left by these 

That there exists a ver}' important agency in Australia that keeps the 
icerya in check, letters received by Professor Riley from various people, 
and especially those lately received by myself from Mr. Crawford, go to 
prove. If this insect is the chief one, is now to be investigated by Mr. 
A. Koebele, who through Professor Riley's influence has been sent there. 

An insect on which so much hope is based will naturally be of interest, 
and I publish in full its description. 

* Monophlebus craivfordii (Maskell), a coccid found liviTig on certain eucalyptus in 
South Australia. 


The following description of the genus and species to which this interest- 
ing parasite belongs is taken from " Insect Life."* It was written by Dr. 
Williston for Professor Riley. The cut has been procured through the 
courtesy of the last named gentleman: 

Lestophonns, new genus. 

Front, broad plane, with .scarcely di.stinguishable hairs in upper part; antenna large, the 
first two joints short; the third two or three times as long as broad, reaching quite to the 
oval margin; arista wanting; face flattened, or gently concave: thorax without bristles; 
scutellum large, about half as long as the thorax, convex ; abdomen short, ovate, rather 
broad, composed of five segments; thinly and bristly hairy; legs rather short and strong; 
middle tibiee, with a minute and indistinct spur at the top; all the tibia^ without erect 
bristles on the outer side before the tip; wings short and broad; auxiliary vein wholly 
wanting; first longitudinal vein first terminating at the basal third, the costal vein at the 
tip of the third longitudinal; second and third longitudinal veins nearly parallel; the 
fourth vein gently divergent; penultimate section of the fourth vein, a little shorter than 
the ultimate section of the fifth; second basal cell and the discal cell united; anal ceU dis- 

Notwithstanding the presence of the anal cell, the present species must, I believe, be 
located with the oscinidse. The absence of distinct bristles on the front, or, indeed, else- 
where on the body, will prevent its location with drosophilinge. In all the four specimens 
that I have examined, the arista seems entirely wanting. I cannot attribute its absence 
to injury. This remarkable character, together "with the absence of the anterior basal cross 
vein and auxiliary vein, and the very large third antennal joint, will, I believe, render the 
genus easily recognizable. I can find the description of no genus that will apply, and I have 
but little or no hesitancy in describing it as new. Modillus, from Europe and Africa, seems 
to be its nearest relative. 

Lestophonns icerya, new species. 

Female, 1.1 mm.; face, front; dorsum of thorax and scutellum deep blue, moderately 
shining; antenna, black oblong, with rounded ends; abdomen punctulate, deep shining 
green, in some specimens more or less blue; legs dark brown, or blackish brown; front 
tarsi more lutescent, or brownish yellow; veins grayish hyaline, the veins dark brown. 


There is no species of insects existing in this State on which so many 
different remedies have been tried, and some of the simplest have proved 
the best. 

Caustic solutions have the disadvantage of hurting the tree, and are not 
especially adapted to penetrate into the egg-sac, which on account of its 
peculiar texture repels most liquids. 

Various soap solutions, some containing kerosene and some whale oil, 
have proved fair remedies, but can in my opinion not be equaled by the 

*" Insect Life" is a periodical published under the direction of the United States Ento- 
mologist, Professor C. V. Riley. 


rosin solutions of which we give three formulas. The first was first tried 
by Mr. A. Koebele; the second by Mr. Alexander Craw, of Los Angeles; the 
third has been given me by Mr. L. D. Green, of Sacramento. From per- 
sonal experiments with them all I am well satisfied with them. 

Recipe No. i.— Four jionnds of rosin, three pounds of sal soda, water to make thirty-six 
pints. Dissolve the sal soda in a few pints of water; when thoroughly dissolved add the 
rosin. Heat until dissolved, and add water finally. Use two quarts of solution to the 
gallon of water. Use at a temperature of about 100 degrees Fahrenheit. 

Recipe No. 2.— One iwuncl of caustic soda, ten pounds of rosin, one hundred gallons of 
water. Prepare as above. 

As, perhaps, owing to the nature of the caustic, the leaves are sometimes 
liable to be affected, I should recommend the spraying of the trees with 
pure water liberally (the water will free the pores of the leaves), then two or 
three days after the applications of the rosin solutions. 

These solutions being cheap they may be used liberally, and two or three 
treatments a year would, I think, keep the trees in fair order. 

Recipe No. S. — Sixty pounds of rosin, sixty pounds of tallow, ten pounds of potash, dis- 
solved in ten gallons of water; ten pounds of caustic soda (Greenbank, 98 per cent). Dis- 
solve the rosin and tallow; when dissolved add caustic water slowly. After mixture is 
made, add ten gallons of water. Use at the rate of one gallon of mixture to ten gallons of 

In the case of the black scale I have found the addition of sulphide of 
soda at the rate of one gallon to seventy-five of rosin solution, the strength 
of sulphide being one pound of concentrated lye to two pounds of sulphide, 
beneficial, and I should recommend the trial of this for icerya. In several 
orchards in Santa Barbara cold water has been sprayed on the trees with 
great power, but while it must be considered superior to many of the inju- 
rious ingredients used, it is only by its constant application that trees can be 
kept clean. 

Banding of the Trunks. 

A most essential help in checking the icerya's spreading, whatever method 
of cleaning is used, is the placing of bands on the trunks of the trees — say 
six inches from the ground — which are usually strips of sheepskin, the 
hairy side turned in and the smooth side out. The bands should be drawn 
as tight as possible, and the outside covered with a mixture of molasses, or 
printers' ink, or any substance that will remain sticky for some time. The 
minute scale, which are constantly traveling through the summer time, will 
be either caught in the sticky solution or find lodgment in the wood. From 
time to time the bands nuist be taken oft' and dipped in scalding water, and 
carefully replaced. The portion of the trunk below should be washed with 
a strong rosin solution, three times as strong as any recommended above. 

Gas Remedies. 

In my last report to the State Board of Horticulture was given an account 
of the various experiments made by difterent parties. In the recently pub- 
lished report of Professor Riley, "United States Entomologist," Mr. Ooquil- 
lett,of Los Angeles, gives an exhaustive account of experiments with various 
gases, but I am of the opinion that none will supersede the hydrocyanic 
gas, first used by Messrs. Craw, Wolfskill, and Coquillett, and later discov- 
ered and recommended by F. W. Morse, of the University of California. 

The opinion then expressed, that no doubt applied, which would make 
the application of the hydrocyanic gas void of danger, and cheapen the 
process on the whole, I am glad to say, has been fulfilled, although my 


sanguine expectation that all eggs could be killed has failed. While it 
may be done, and has been done, so many intervening causes, especially 
the difficulty of keeping a tent gas tight, in a treatment of an orchard, I 
dare say the only practical way of exterminating the insect will be by two 
treatments — say four weeks apart. The first treatment would exterminate 
large bugs, everything not in the egg state, and the majority of the eggs. 
The second, the remainder — all eggs then being hatched. 

Modes of Treatment. 

In Bulletin No. 73 Mr. Morse gives full directions for using the gas. To 
avoid the injury to the foliage, which, according to the later investigations 
of Mr. Morse, is due to free ammonia gas, Mr. Morse employed carbonic 
acid gas, which was generated simultaneously by pouring the mixture of 
cyanide and carbonate solution together in the receiver. 

The Process. 

I copy the following from Bulletin of Experimental Station, of Berkeley, 
No. 73: 

Solutions. — The cyanide of potassium solution (nof the "mining cyanide") is prepared 
by dissolving the salt in the proportion of ten pounds to two gallons of water. Place the 
cyanide in the vessel in which you wish to make the solution, and add the water to it, 
bring to nearlj^ boiling, with occasionally stirring, and let it cool. It is best to make the 
solution one or two days before using, in order to avoid as much as possible the stronger 
odor of a freshly prepared solution. 

In the prescribed dose an excess of acid has been recommended, in order that complete 
action shall always take place. It is desirable to test the residue occasionally, to be satis- 
fied that the work is complete. This is done by adding a little more acid, and noting 
whether boiling or effervescence takes place upon stirring; care being taken not to mis- 
take the effervescence from the material accidentally gathered on the sides of the cylinder 
during the operation for that of material which should have been acted upon in the bottom 
of the cylinder. 

Doses According to Size of Trees. 

The regulation of the doses for the different sized trees, so as to produce uniform treat- 
ment, is calculated on the basis of the results of the experiments which determined the 
amount of each constituent for a twelve-foot tree. The following table indicates the 
amounts of trees of diflerent dimensions of top, based upon the rates of cubical contents. 

The amount of material for each dose differs from that previously recommended (Bul- 
letin 71), by a decrease of one fourth in the amount of soda, and a slight change in the 
acid; the cyanide remains the same. Varying amounts of soda were used, showing quite 
clearly that a decrease of one fourth was possible, but further than this an appreciable 
lessening in the preservative effect was noticeable. 

Size of Tree. 

Cyanide of Potas- 

Bicarbonate of 
Soda — Pounds. 

Sulphuric Acid — 
Fluid Ounces. 

Five feet -. 


































Six feet ..- 


Seven feet .. 


Eight feet.- 


Nine feet 




Eleven feet 


Twelve feet 


Thirteen feet .. 


Fourteen feet . . . 


Fifteen feet -.. 


Sixteen feet 


Seventeen feet- 


Eighteen feet 


Nineteen feet 

Twentv feet ..- 




The prescribed doses for small trees will be found too small, unless the trees are very 
low. The calculations are all based upon the supposition that the trees are nearly spher- 
ical in shape; but in most cases it will be found ihat the trees of small dimensions have 
most of the branches raised fully four or five feet from the ground, thus leaving a large 
volume on the inside of the tent unoccupied. Due allowance must be made when the 
height of the tree is so much greater than its diameter. 

Mode of Operating. 

Place the desired amount of acid in the acid receiver, then put the required amount of 
soda in a convenient vessel (a gallon measure serves the purpose well), and add water to 
bring it to a thin paste, stirring well to get rid of all the lumps, before the cyanide solu- 
tion is added. Mix the cyanide solution and the soda paste so that the undissolved soda 
will remain evenly distributed throughout the mixture. Pour into the cyanide receiver, 
and allow it to run slowly and regularli/ upon the acid which has previously been run into 
the generator. As soon as the cyanide solution begins to enter the generator, the blower 
should be turned slowly, and continued until all the material is run in and violent action 
ceased. This usually takes a minute or so after the materials have united. Then follow 
with violent blowing for a minute or so, and allow to rest until about fifteen minutes from 
the beginning of the treatment, when violent blowing is repeated for one minute. The 
time occupied in running in the mixture should be about as follows for the different sized 
trees : 

10-foot tree - 4 minutes. 

11-foot tree - - - 5 minutes. 

12-foot tree. --- 5.5 minutes. 

13-foot tree. , -- — -- 6 minutes. 

14-foot tree. - -- 7 minutes. 

15-foot tree 7.5 minutes. 

16-foot tree - -- 8 minutes. 

17-foot tree --. 9 minutes. 

18-foot tree .- --- 10 minutes. 

It is quite important that the time of injecting shall be closely observed, and should be 
lengthened rather than shortened. No time will be saved by hurrying this partof the treat- 
ment, for if run in too fast lumps will be formed which will take some time to be com- 
pletely acted upon by the acid. If the time is slightly lengthened no serious results will 
follow. Some of the largest doses have been completelj' acted upon in less than fifteen 
minutes, thus making it possible for a single generator to serve two tents when the pre- 
scribed time of exposure is adopted. It is advisable to continue the treatment of a single 
tree for about thirty minutes, although the time may be slightly shortened when two tents 
are used. 

This method can be used when the temperature does hot rise much above 
70 degrees F., but when it becomes much higher it will affect the foliage. 
To avoid this trouble it is suggested to do the work during the cooler por- 
tion of the year. 

Dry Gas Process. 

In Mr. Coquillett's report to Professor Riley in reviewing the different 
processes is favored the method of passing the gas through sulphuric acid, 
which method he describes as follows, under the name of the dry gas, his 
idea being that the damage done by hydrocyanic gas, when generated, is 
due to moisture which carries particles with it: 

I have already alluded above to the fact that the drier the gas the less iniurious was 
the effect upon the tree confined in it; and it occurred to me that the gas mi^ht be gener- 
ated in the usual way, by acting with sulphuric acid upon potassium cyanide dissolved 
in water, and afterward be dried by passing it through some medium that would deprive 
it of its moisture. Knowing the great avidity of sulphuric acid for moisture, I cleter- 
mined to use it as a drier for gas, and several tests which I have made with this gas dried 
in this way prove that it does not injure the foliage of orange trees confined in it, while 
it is just as fatal to the scale insects as is the moist gas. The density of the acid through 
which the gas had passed was lowered about one degree, as indicated by the hydrometer ; 
but this would not prevent its use for generating the gas. 

The cyanide is dissolved by boiling in water for a few minutes, using one gallon of 
water for each five pounds of "cyanide. It is desirable to use as little water as possible for 
this purpose, but the quantity could not be very much reduced from that given above. I 
have tried to dissolve five pounds of the cyanide in half a gallon of water, but all of the 
cyanide had not dissolved after half an hour's boiling. For every ounce of the cyanide 
solution use half an ounce of sulphuric acid, but it is always desirable to add some of the 
acid to the prescribed dose, in order that there may be an excess of the acid. No evil 
results will follow if double the proper quantity of the acid were to be used, whereas if less 


than the proper quantity were nsed the whole of the gas would not be evolved from the 
cyanide solution ; hence the advisability of always using an excess of the acid. 

In generating the gas the acid should flow upon the cyanide solution in a very fine 
stream. When they come in contact violent action at once takes place, and the gas is 
rapidly given off in the form of dense whitish fog, resembling smoke and possessing a 
peculiar odor. When this gas, diluted with air, is inhaled, it produces a dryness in the 
mouth and throat. 

It is impossible to give any definite rule for using the different ingredients that will 
apply to the differently sized trees, owing to the fact that trees of the same height may 
have a varying diameter of top; thus orange trees twelve feet tall may have a diameter 
of top ranging all the way from six to ten feet. The manner in which the tree is pruned 
will also make a difference in the quantity of the ingredients to be used, some trees 
being allowed to branch almost from the ground, while others are trimmed up from 
three to five feet from the ground. 

The following table based upon numerous experiments which I have made on orange 
trees under a tent ten feet tall and having a transverse diameter of ten feet, will give a 
good idea of the proper quantities of each ingredient to be used in treating citrus trees : 

Height— in Feet. 

Diameter — in Feet. 

Cyanide Solution— Fluid 

Sulphuric Acid— Fluid 





















This table is based upon the cubical contents of the space inclosed by the tent, sup- 
posing that the lower part of the tent rests upon the ground. No harm will result to the 
tree if twice the quantit^y that I have recommended be used ; but of course, for the sake of 
economy, it will be desirable to use only such quantity of each ingredient as will be nec- 
essary for destroying the scale insects infesting the tree to be treated with this gas. The 
sulphuric acid should have a density of 65 degrees when tested with an acid hydrometer; 
should its density be lower than this, use an extra ounce of the acid for every 5 degrees 
of density below 65 degrees. 

According to Mr. Morse's experiments, however, it has been proved that 
the injury to foliage was caused by ammonia, which, especially through 
the direct influence of sunshine, is evolved from the gas confined in the 
tent, and Mr. Morse suggests, therefore, instead of passing the gas through 
liquid sulphuric acid, to construct a drier large enough to have it filled with 
a quantity of pumice stone saturated with sulphuric acid. To test this idea 
on a larger scale, and to also test the practical workings of the Culver tent, 
I obtained the consent of the Commission to have an apparatus made. 
From Mr. J. P. Culver, of Los Angeles, I obtained permission to make use 
of his drawings and plans, and had a tent constructed according to his 
idea, with slight moditications except to size of timbers, frame, etc., which 
were reduced one half, fully, making the whole apparatus so that it could 
be drawn along on level ground by one horse. The frame and sled on 
which the tent rests are five and a half by twelve feet, and are made of 
Oregon pine with runners of oak. 

The tent proper consists of two even halves swung on heavy hinges fast- 
ened to the mast, and the frame on which the cloth is fastened is made of 
two by two-inch ash. The curved part of the frame or arch is made of 
one by two-inch, lapping and bolted together. Where the two frames meet 
to close the tent a strip of heavy felting is nailed on it. The tent cloth is 
made of heavy, fine-woven drill, oiled with linseed oil, and is tacked on 
the edge of the frame. The mast on which the heavy iron hinges are f;ist- 
ened is made of a four by four, but it would be advisable to have this a 
little heavier or have it banded with iron. On the top two iron rods, with 
thumb-screws and thread in the middle, are held in iron hooks. These 
rods are an essential support for the tAvo wings of the tent when they are 
swung on the hinges. When a tree is to be treated the frame is drawn 



closely up to the tree, the mast on line with center of the tree, and the 
wings are closed. The parts are kept tight together by means of a rope 
passing through screw-eyes placed alternately on both frames, thus lacing 
them together after the manner of a shoe. When being drawn from tree to 
tree the wings of the tent are swung back, the lower end of tlie frame rest- 
ing on a scantling and fastened by means of bolts working in a slot, the 
frames being braced by ropes, one on each side. In windy weather some 
difRculty is experienced in handling this as all other tents. The cloth falls 
on the ground and laps sufficiently to cover both ends where the two frames 

On the whole, I believe it the best appliance for covering small and 
middle sized trees, but I should not recommend it for trees larger than 
twelve to fourteen feet. The frame of the tent I operated with was twelve 
feet high. The Titus frame and tent were the ones used by Mr. Morse in 
his experiments. This apparatus is well described by Mr. Coquillett in 
his report as follows: 


This apparatus was devised by Mr. L. H. Titus, of San Gabriel, and is especially designed 
for operating on tall trees, and consists of four corner posts made by bolting together two 
boards in such a manner that they form a right angle with each other; at the upper ends 
these posts are connected by crosspieces formed of boards bolted together like those form- 
ing the corner posts. Two of these crosspieces are longer than the other two, and are 
placed on opposite sides of the frame ; they are connected near the middle by two cross- 
pieces, between which is placed the roller upon which the tent is to be wound when being 
drawn olf the tree. These various crosspieces are braced, as shown in plate. 

The lower end of each of the rear corner posts is rigidly attached to an axle, on the 
outer end of which a light wheel is placed, while the inner end is connected with the cor- 
ner post by an oblique brace. The lower end of each of the front corner posts is attached to 
the middle of an axle having a light wheel at each end. The post is attached to the axle by 
an iron bolt, which permits the wheels to be at the saine moment turned, the one forward 
and the other backward, like the forward wlieels of a wagon or buggy. By means of this 
arrangement the fumigator can be turned about in a circle. The front and rear corner 
posts on each side of the fumigator are connected with each other by a crosspiece extend- 
ing from one to the other, and strengthened by braces which extend obliquely from the 
crosspiece to the posts. 

When this fumigator is in use the front and rear crosspieces, as extending from the 
posts on the other side to those on the other, are removed, so as to permit the frame to 
pass either forward or backward over the trees. 

The top of the tent is attached by three ropes to the roller, while to the lower edge of 
the tent are attached four ropes, placed at equal distances from each other; each of these 
ropes passes through a pulley attached to a frame near each upper corner, and the end of 
the rope is attached to the lower edge of the tent at the place where the opposite end of 
the same rope is attached. For winding the tent upon the roller an endless rope is used 
this passes around a grooved wheel at one end of the roller and is carried through a 
pulley near the upper end of one of the rear corner jiosts ; from this point it passes to and 
around a grooved wheel fastened to the crosspiece near the lower end of this post, and 
this grooved wheel is operated by a crank. 

In taking a tent off of a tree each of the corner ropes is pulled through its pulley, draw- 
ing the bottom of the tent upward, thus turning the tent inside out; after the tent has 
been drawn up as far as possible, the crank operating the grooved wheel that works the 
endless rope is turned, winding the tent upon the roller until it has been entirely removed 
from the tree. The fumigator is thus drawn forward until the tent is brought directly 
over the second tree, when the ropes attached to the lower edge of the tent are loosened, 
permitting the tent to drop down over the tree, at the same time unwinding the tent 
from the roller, and continuing this until the tent rests upon the tree. 

TJie Generator. 

The generator consists of castings and pipes and was n:iade by George 
Gumming & Co., but was devised by Mr. Morse. It consists first of an 
earthenware jar, which is held firmly by means of a frame, the joint being 
made tight by means of heavy felting. Through this board two pipes pass 
connected with receivers, one for the cyanide and one for the acid. When 
by pouring the acid on the cyanide the gas is given out, it passes onward 
through a four-inch pipe, which connects with the drier a largo iron cast- 


ing, six by eighteen inches, which is filled with pumice stone moistened 
with sulphuric acid, and is made so that it can be revolved for the purpose 
of bringing all particles of the pumice stone in contact with the acid. 
Through this drier the gas passes onward into pipes, which lead into the 
tent. Parallel with the pipe, passing toward the drier and connected by 
an elbow, is a galvanized iron pipe, on top of which is fastened a Gumming 
fan blower. The blower can be made to act two ways by means of a cii'- 
cular valve, this being moved by a rod. The blower blows forward through 
the pipe, which meets the gas which has passed through the drier, driving 
it into the tent. The object of the valve is to prevent the escape of any 
gas which has not passed through the drier and which might contain 
ammonia. The suction pipe of the blower passes directly into the tent, 
and consequently when the gas is in the tent it is kept circulated when the 
blower is at work. 

The experiments on orange trees ranging from eight to twelve feet high 
were made during the months of June and July of 1888, near San Mateo, 
at the grounds of H. Barroilhet, Esq., who kindly furnished me with 
assistance in transporting the machinery and putting it up, also in helping 
to operate the apparatus. Owing to the trees being very near together it 
was impossible to use horse power in moving the tent, and this made our 
progress very slow and tedious. Strong winds interfered also, very seri- 
ously tending to make the tent leak. The tests were made during all 
kinds of weather, from 60 degrees F. to 85 degrees F., calm and windy, 
and when the drier was well saturated with acid no harm was done to the 
tree; young fruit even during a confinement of forty minutes during the 
noon hour, not being affected. On the other hand, when for the lack of 
sulphuric acid the drier was not sufficiently charged, serious harm resulted, 
the foliage in a couple of days falling off. This was especially the case 
when the operation was done during the middle of the day, but bad effects 
also resulted when done in the evening as late as 7 p. m. at a temperature 
of 60 degrees. The effect on the icerya, which were present in immense 
quantities, was nearly the same when a tree was confined for twenty-five 
minutes, as when for forty-five minutes, only the bugs themselves and from 
50 to 75 per cent of the eggs are killed. That the prevailing wind may 
have had a good deal to do with my failure of doing better at such times 
is possible, but I am satisfied from general results that when orchards have 
to be treated on a large scale it will be found necessary to give two treat- 
ments for extermination, and I should recommend in accordance with this 
view that these two treatments be given at four-week intervals, which will 
give an opportunity for remaining eggs to be hatched. 

Cost of Treatment. 

Placing cyanide of potassium at 50 cents a pound and acid at 8 cents, 
we have the solution of cyanide at a cost of 1 cent, and acid per ounce y^ 
cents, making it 27^ cents for a twelve-foot-high tree for one treatment. 

On level ground two men and one horse can handle the tent and treat 
two trees per hour, allowing twenty-five minutes for the dose to act and 
five minutes for moving and getting ready. One horse, 50 cents; one man, 
$2; one man, $1 50; total, $4; or an expense of 20 cents per tree. 

If two apparatus are used they can be worked with the same force, mak- 
ing the expense but half, or 10 cents, apiece when forty trees are being 
treated once, or for two treatments 20 cents each. To this add the cost of 
material, which would, for a twelve-foot-high tree, be 55 cents. Besides 
this, there must still be added the price of labor of putting on proper bands. 


For this purpose sheepskin has been foand to be the best; strips four inches 
wide. A skin, costing say 30 cents, will make ten. 

It must, however, be remembered that bands must necessarily be placed 
on trees that are being sprayed, and therefore must not be counted as an 
expense exclusively attending the gas treatment, being common to both 
spray and gas process. 


Order, Hemvptera; Family, Coccidn. 

Figure No. 23. 

Figure No. 22. I'lg" 

Figure 22, Dactylopius Destructor; Figure 23, Dactylopius Adoniduni ; Figure 24, 
Dactylopiu.s Longifilis. 

Allied to scale insects, and at times equally destructive, are the mealy 
bugs, of which the genus Dactylopius is a representative. The figures give 
a good idea of these insects. They are soft and of a pale pink color, gen- 
erally covered with a mealy powder, hence the name. The common spe- 
cies, D. adonidum, is found nearly in every greenhouse in the world, and 
in Californian climate survives on many kinds of plants and have at vari- 
ous times proved quite troublesome in Los Angeles Ci)unty on oranges. It 


has at times disappeared, and it is more than likely that it has been de- 
stroyed by the Scymnus marginicollis, figured under the head of useful 
insects. A species of Scymnus is reported by Professor Comstock to destroy 
them in Florida. Unless checked by natural enemies, the mealy bugs 
multiply very rapidly, and mass themselves in the corners of the leaves. 
The plants turn black from the fungus growth growing on the honeydew, 
and the bush presents the same appearance as a scale-infested plant. 


The most successful remedies I know of are the rosin solutions recom- 
mended under the head of the fluted scale. 



Winter washes — Modes of preparing — Condition of trees for spraying — Time of appli- 
cation — Caustics — Sununer remedies — Proportions of ingredients— Kerosene emulsion. 


For Scale Insects on Deciduous Trees. 

The wide difference in the atmospheric conditions in the different parts 
of the State has proved, as might be expected, that different remedies will 
be found suitable to different localities. When comparing the efficac}^ of 
a wash used in one locality, with that of another in another locality, we 
are apt to be misled. Only by trying the same remedy in different locali- 
ties can definite conclusions be reached. As a general thing, the caustic 
remedies have been used with good success in the more cool and moist cli- 
mates of the coast. When well applied, they must be considered among 
the best and most efiiicacious we have. On the other hand, they have been 
generally less successful in the interior of the State, where a dry atmos- 
phere prevails for a longer time. 

In using caustic washes the following points must be especially taken 
into consideration: 

1. Condition of trees. 

2. Time of application. 

1. Trees must be dormant; otherwise the fruit buds, especially when 
advanced, will be damaged. 

2. A humid atmosphere, without being actually so as to cause w^ater to 
run down the trees, is much more preferable than very dry weather; in 
fact, as was proved last season, actual damage has been done to trees when 
wash has been applied during such weather, and the results in killing the 
scale have also been unsatisfactory under such circumstances. 

While we still believe that the caustic, in the proportions given below, 
when used under precisely favorable conditions, is as sure and wholesome 
a remedy as we can apply to apples, pears, and plums, the simple whale 
oil and sal soda remed}-, especially for peaches and cherries, has proved 
very efficacious; but great care must be exercised in applying it, as the 
oil is apt to separate unless well stirred, and the compound kept warm. 



Aspidiotus Pevniciosus. 

For badly infested orchards I recommend: One and one quarter gal- 
lons of whale oil; twenty-five pounds of sal soda; dissolve the sal soda in 
twenty-five gallons of water and heat it to boiling. When boiling pour 
the whale oil in. Apply the wash when cooled to 130 degrees F. The 
whale oil forms a kind of emulsion, most of the oil remaining free. After 
allowing this dose to act for three or four weeks, apply caustic solutions in 
this proportion: One pound of concentrated lye (American), of 80 per 
cent; or four fi^fths of a pound of powdered caustic soda, of 98 per cent; or 
one pound of solid caustic soda, of 76 per cent; or one and one half pounds 
of solid caustic soda, of 63 per cent. Any one of these to one half pound 
of commercial potash, at 52 per cent. To be dissolved in six gallons of 

Mode of Preparing Washes. 

The easiest way to prepare the alkali washes, especially the solid concen- 
trated lye, is by suspending the material in a barrel of water, either putting 
it on a perforated piece of tin or colander. Being thus suspended the dif- 
fusion is quite rapid, and the material will require but little looking after. 
By using hot or boiling water the action, of course, is hastened very much. 
When dissolved thoroughly, each kind having been kept separately, they 
are mixed and stirred well, so that they become thoroughly mixed. The 
liquid should be strained through a fine sieve (brass) or a cloth, so that no 
clogging is possible when the wash passes through the nozzle. 

The San Jose nozzle has been and is very generally used, but for lye washes 
it is, in my opinion, inferior to the Imperial and the Cyclone. The latter 
has the advantage of throwing the stream better on the underside of branches 
and foliage. When a pump with two outlets is at work, the two kinds of 
nozzles may be used to advantage. One man may work principally on the 
upper part of the tree with the Imperial (because its spray, being thrown 
straight, hits the more vertical branches squarely), while the other man 
will reach the lower more horizontal branches with the Cyclone spray, car- 
rying, as it does, either upward or downward. 

A very good nozzle is that invented by John Crofton, and sold by H. P. 
Gregory and Woodin & Little. It has the advantage of clearing itself by 
a turn of the bib. Its spray is similar to that of the Cyclone nozzle. 


The object to be obtained by using the caustics after the sal soda and 
whale oil is to saponify any oil that might have remained on the tree, and 
which would have a tendency to clog the poi'es of the bark. I believe this 
treatment will prove the most eflicacious yet recommended. 

The cost of whale oil is 30 cents a gallon, in fifty-gallon barrels; 35 cents 
in cases. As to caustic, it must be remembered that the price will vary 
according to quantity, and that the purest product is the cheapest. The 
green bank, 98 per cent, is considered the best and the least varying; next 
to this, American concentrated lyes; George F. Lewes, Menzies & Co. seem 
to be most reliable. 

In the moist coast counties we would recommend the caustic in this pro- 
portion for pears, apples, and plums, the trees to be perfectly dormant: One 
pound of solid concentrated lye (American), of 80 per cent; four fifths of 
a pound of powdered caustic soda of 98 per cent, one pound of solid caustic 


soda of 76 per cent; one and one quarter pounds of solid caustic soda of 63 
per cent. Any one of these to one half pound of commercial potash, at 52 
per cent. To be dissolved in four gallons of water; one quarter of a pound 
of whale-oil soap (80 per cent) to each gallon of mixture. 

For peaches and cherries, and in the drier localities, whale oil and sal 
soda in this proportion: One gallon of whale oil to twenty-five pounds of 
sal soda; twenty-five gallons of water. Prepare the same as above. 

For the different kinds of lecaniums, such as the black scale and brown 
scale infesting deciduous trees, slightly weaker solutions than those used for 
the pernicious scale may be used with good effect. As regards the many 
different kinds of solutions used and offered for sale, the best advice is to 
not experiment too much, on a large scale at least. If by experience in 
the locality certain remedies have proved themselves reliable, they had 
better be adhered to. In using new remedies use them only on a few trees, 
and allow a season to pass before you consider that you are sure of their 
efiicacy and influence on the tree. As a general thing, compounds that 
are very sticky and oily, remaining for a long time in such a condition on 
the trees, should be very cautiously dealt with until their nature and com- 
position are better understood. Especially are these dangerous to the stone 
fruits, and unless properly diluted will prove positively fatal. 

As regards the use of kerosene as an insecticide, the greatest danger is to 
the roots. It should only be used as an emulsion with soap, or as a com- 
ponent part of the soap. 


Solutions are applied with best results when the majority of the insects 
are hatched, and persons should watch for this time; the first brood of the 
Aspidiotvs 2:>erniciosi(s appears generally when the cherries are turning color. 

As a general useful wash the sulphide of soda or sulphide of potash, with 
whale-oil soap, has proved very satisfactor3^ One and one half pounds of 
sulphur; one pound of concentrated lye, or powdered caustic soda, four fifths 
of a pound ; or caustic potash, one pound ; fourteen pounds best whale-oil 
soap (80 per cent soap) ; fifty-five gallons water. Dissolve the lye in one 
gallon of water, and boil the sulphur until dissolved. Dissolve the soap in 
the water; mix the two and boil them a short time; use at 130 degrees F. 
in vessel. 

I do not hesitate to recommend this solution also for orange and lemon 
trees infected with the various lecaniums, and, if properly used, also for the 
red orange scale. It is, however, not to be expected that on an orange tree, 
with its dense foliage, these insects could be exterminated. This can only 
be done by cutting the tree back in the spring and washing the trunk and 
main limbs most thoroughh^ 

For the red scale the gas process described under the head of the fluted 
scale is absolutely the most thorough, and we are glad to learn that leading 
growers are preparing for it. 

Another solution, first recommended by Mr. B. M. Lelong and tried pretty 
thoroughly by people on the Sacramento River, is the following: 

For Scale Insects on Deciduous Trees — Sprayed on Fruit. 

Ingredients for one barrel of fifty (measure) gallons: Weight, about four 
hundred and fifty to five hundred pounds; ten pounds caustic soda, 98 per 
cent; ten pounds potash; forty pounds tallow; forty pounds rosin. First — 
Dissolve the potash and soda in ten gallons of water. When dissolved, 
place the whole amount in the barrel to be used. Second — Dissolve the 


tallow and rosin together. When dissolved, add the same to the potash 
and soda in the barrel, and stir well for five minutes or so. Leave standing 
for about two hours, then fill up with water, stirring well as every bucket 
of water goes in. Use the following day, one pound to the gallon of water; 
apply warm. This remedy is best adapted to pears and apples. 

1 append also here the receipt for Professor Riley's kerosene emulsion, to 
which reference is made in various places: 

Kerosene, two gallons=67 per cent; common or whale-oil soap, one half 
pound; water, one gallon=3o per cent. 

Heat the solution of soap, and add it boiling hot to the kerosene. Churn 
the mixture by means of a force pump and spray nozzle for five or ten 
minutes. The emulsion, if perfect, forms a cream, which thickens on cool- 
ing and should adhere, without oiliness, to the surface of glass. Dilute, 
before using, one part of the emulsion with nine parts of hot water. The 
above formula gives three gallons of emulsion, and makes, when diluted, 
thirty gallons of wash. 



Codlin moth— Eemedies for— Paris green— London purple— Sulphur— Measures to catch 
the larvae- Picking off infested fruit — Thissell's moth trap— Measures aiming at the de- 
struction of the moth— Remedies aiming at the destruction of the hibernating larvse— 
Parasites and predaceous insects — Peach moth. 


Carpocajmi Pomonella. (Fig. So.) Order, Lepidoptera; Family, Tortricidx^ 

Figure No. 25. 

cription.—a, section of an apple ruined by the burrowings of the larva?, and cliannel 
lich it leaves, when full grown, at the left; b, the point at which the egg, for the first 


by whic -^, ^, , . -^ 

brood, is usually laid, and at which the young worm enters; c, the worm or larva, full 
grown, with black or brown head, body white when young, cream colored at maturity, and 
pink just before changing to chrysalis; h, head of larva magnified ; /, the cocoon which it 
spins, usually under a scale of bark; d, the chrysalis to which the larva changes in the 
cocoon, of an amber or chestnut-brown color; /, the moth which escapes from the chrys- 
alis, at rest; g, the same with wings expanded. 


Size of moth: Length, seven sixteenths of an inch ; spread of wings, nearly three fourths 
of an inch. Color of moth: Body, richly bronzed light drab; fore wings, mottled gray 
and drab, with dark coppery bar across hind margin, or a golden eye spot near inner 
angle; hind wings, plain drab, a little darker than body. Cocoon: White inside, but usu- 
ally so covered with minute pieces of surrounding bark, etc., as to be overlooked by a 
■careless observer. 

The ravages of this insect are perhaps better known and more widely 
spread than those of any insect. Its original food plant is the apple, which 
it prefers, but the pear and quince are almost equally subject to it. The 
moth makes its appearance in May and June, when it deposits its egg in 
the blossom end. The young worm hatches in seven to ten days, and eats 
its way into the fruit, and in twenty days its full growth is attained, and it 
goes out through the side of the apple and, by means of its spinneret, 
reaches the ground or some large branch. If landed on the ground it usu- 
ally seeks the trunk, which it ascends and soon finds a hiding place under 
the loose bark, where it spins its cocoon, and in eight or ten days comes forth 
a moth, ready to lay eggs anew. As there is not at this time offered as 
distinct and conspicuous place for it to deposit its eggs as when the blossom 
end was pointing upward, the egg is laid all over the fruit, and especially 
at a point where two fruits touch. Usually we have in this State two 
broods at least, but more often three, and naturally, if unchecked, the 
increase from the first to the last is enormous. The worms escaping from 
the fruit in the fall hibernate as larvse under the loose bark in storehouses 
or any available dry place. 

The natural habits of this insect have led us to adopt various remedies, 
which may be classed thus: ■ 

1. Those aiming at killing the young larva? while in the fruit. 

2. Those aiming at destroying the mature larva?. 

3. Those aiming at destroying the moth. 

4. Those aiming at destroying the hibernating cocoons. 

Measures to Kill Young Lnrvie while in the Fruit. 

Sprayings. — This mode of protection is evidently the most promising of any, and, in the 
East, where it has been tried for a number of years, it has given quite satisfactory results. 
Of these solutions the arsenic compounds have been the preferable. 

Paris Green, London Purple, White Arsenic. 

Paris Green. 

Paris green is a compound of arsenic and copper. It is a far more powerful poison than 
arsenic alone, and is not soluble in water, hence will remain much longer on the trees. 
As stated before, in the Eastern States it is used in preference to arsenic, as it is not so 
liable to be washed off by rain, and another advantage is that it is not so liable to hurt the 

The spraying should be done for the first time just when the flower leaves 
are falling; used then very little of the poison will adhere to the leaves, 
they being, as a rule, comparatively undeveloped. 

The strength to be used for this first spraying may be safely put down at 
one pound to two hundred gallons, assuming that the Paris green will con- 
tain 55 per cent of arsenic. When used much later it must be diluted to 
one pound to three hundred gallons. For early ripening apples one spray- 
ing ought to be sufficient, unless, as sometimes happens, the blooming is 
very irregular. For winter apples it is advisable to give a second spra3ang 
before the apples commence to turn downward. As regards the strength 
safe to use, it must vary according to locality and variety of apples. In 
the damp coast counties, where often heavy night fogs prevail, it should 
not be used any stronger than one pound to three hundred gallons; in the 
drier valleys it seems safe to use it stronger. Certain varieties seem very 


liable to have the foliage burnt; especially is this the case with the Yellow 

In using the Paris green it has been found convenient to mix a few 
pounds of soap to the barrel. This helps to keep the Paris green suspended, 
otherwise it settles very rapidly and only continual stirring will keep it 
afloat. In spraying a fine nozzle should be used and the aim should be to 
wet every blossom. 

I am opposed to the use of Paris green, when used later than the time 
of the apples turning on their stems. Too much poison may lodge on the 
apples by the stem-end, rendering it decidedly dangerous. For a third 
spraying whale-oil soap and sulphide of soda is preferable. Although not 
an active poison, it seems to deter the moth from laying its eggs, and those 
laid are nauseated by the compound. 

London Purple. 

London purple is another arsenical compound. It is the residue from the manufacture 
of analine dyes, and contains lime, arsenious acid, and carbonaceous matter. It is more 
soluble, more adhesive, less poisonous, and especially for the last reason has its strong 

However, its very solubility makes it much more destructive to foliage, 
and in moist localities it is unsafe to use, except when the foliage is very 
little developed. Arsenious acid, it is contended, can be used with as much 
safety as any of the other compounds, but its innocent appearance is an 
objection, when the carelessness of the average man is considered. I have 
used it at the rate of one pound to six hundred gallons, applied early in the 


In a report of a horticultural institution in Germany — Geisenheim-on- 
the-Rhine — R. Goethe, Director, I find record of partial success, obtained 
by scattering sulphur a number of times on the fruit. 

Measures to Catch the Larvse. 

Banding S)/stern. — This mode of protection, which has been practiced in the Eastern 
States, has been tried in this State more than any other. Its usefulness is based on the 
observed habit of the larvie when leaving the apple to seek shelter under the bark. The 
band about the tree provides artificial shelter for the worm, and the majority of the larvae, 
no doubt, find their way to this; but a sufficient niunber for giving future trouble find 
other hiding places on fences, buildings, etc., and perhaps more than anywhere else under 
clods at the foot of the tree; and it is here, in an old orchard, that I have almost inva- 
riably found cocoons. To make the banding system more effective, the ground right 
around the tree, as well as the whole orchard, should be thoroughly pulverized. The 
greatest obstacle to the success of the banding system is the neglect of one orchard owner, 
while his neighbor conscientiously and thoroughly performs the work. The neglect or 
half-done work of one person among his trees, is siifficieut to counterbalance the attent- 
ive and thorough work of many others around him. It is evident that in a thickly set- 
tled community, unless all concerned do their duty, the work will be largely in vain. 

Picking off Infested Fruit. 

The practice of picking off infested fruit, of course comes under the 
same head as the band system. In that it aims at a reduction or exter- 
mination of the next brood, it should go hand in hand with the band sys- 
tem. It is also open to the objection that unless the neighbors do their 
duty little good is accomplished. 

ThisselTs Tmj)- 
The so called moth trap, invented 1)v INlr. Thissell, of Winters, is founded on the same 
idea as the band, but is arranged so tluit when the motli hatches it remains in the trap. 
This trap consists of a collar of tin, to which a piece of wire cloth is attached. The collar 
is in the middle, so as to hold the wire away from the tree. A piece of sack is placed 
around the tree. The wire cloth is gathered above and below the collar and fastened 



closely to the tree with tacks. The meshes are just large enough for the larvpe to enter. 
To make allowance for the larv?e above the average size, the tin collar at the middle is 
perforated with holes slightly larger than the wire meshes. The moth when hatched can 
not possilily escape, but remains to die in the trap. The trial I have seen was verj^ satis- 
factory—all the larva^ placed on the trunk finding their way directly into the trap. " It will 
be seen that this trap saves all the work of searching the bands, which in itself amounts 
to a great deal. The absolute necessity of looking at the bands at shorter intervals makes 
the system extremely annoying, as all other work of the time must be laid aside for this. 
(3n tlie other hand, Thissell's trap is rather expensive, being from 15 to 30 cents, according 
to the size of the tree. It has also the objection that it does not allow for the expansion 
of the tree, a fault quite serious when young trees are to be protected. 

Pleasures aiming at destruction of the moth. 

Light to attract the moth. — This means, aiming at the destruction of the moth, has been 
least successful of all. From the testimony of the best observers, both here and in the 
East, we may conclude that the number of codlin moths caught and killed by light is 
very small, as compared with the number of other night-flying insects, many of which 
are useful. The device — a lamp above a can of .oily mixture — in my judgment has been 
no more successful than others on the same principle. 

Cons iilled with vinegar and molasses, or other similar compounds. — This device, it seems to 
me, has been least successful of all, attracting all sorts of insects but the ones most of aU 
desired. It must be regarded as a failure. 

Remedies aiming at the destruction of the hibernating larvse. 

To prevent any larvse from hibernating on trees, all old loose bark should 
be scraped off and the ground treated to a depth of six inches below the 
surface. If the trees are covered with lichens, which is very often the case, 
the spraying of the trees with an alkaline wash will be of excellent service, 
killing any that might be there, and also invigorating the tree. If potash 
is used, one seventh of a pound of concentrated lye and one quarter of a 
pound of potash to one gallon of water is a good mixture. 

Note. — The experience of last summer has demonstrated the necessity of removing the 
second crop on apples and pears. In many varieties of apples, as well as in pears, there 
s a delay of eight or ten days before some of the weaker fruitspurs push. These will be 
-cached with the second spraying. But besides this, there are on some varieties of apples, 
or iiistance the Esopus Spitzenberg, a distinct second flowering, fully a month after the 
rst. As this seldom develops good fruit and first invites the codlin moth, tl^e easiest 
way to dispose of them is to clip off the whole fruitspur when in bloom. The neglect of 
doing this has been to counteract the influence of the spraying altogether, what many per- 
sons nave learned to their sad experience this year. 

In early fruit sections, such as the Sacramento River, the removal of the second crop 
of Bartlett pears has, according to the experience of Sol. Runyon, Esq., one of the most 
successful growers there, the influence of checking the codlin moth, so much so_that the 
damage to the next year's first crop is comparatively slight. 

Parasites and Predaceous Insects. 
In report of the Department of Agriculture, 1887, Mr. L. 0. Howard says: 

Of true hymenopterous parasites at least three species have been recorded in Europe 
and two have been bred in this country. The European species are riiygadenon brevis, 
Grav. ; Pachymerns vulnerator, and Campoj^lex pomorum, Ratz. ; all ichnennionids. The 
species whicli infest it in this country are also ichneumonids, and are Pimplu annnlipcs, 
Br., and Macrocentrus delicatus, Cress. Both of these insects were first recorded by Profes- 
sor Riley, who reared them from the codlin moth in Missouri in 1872. The Pimpla is 
quite a widespread species in all parts of the country, and is not by any means confined 
to the codlin moth. Professor Riley has recorded it from the walnut case-bearer (.-Icro- 
hasis jnglandis) and has also reared it from the cotton worm of the South {Aletin xrilina) 
and from Grapholitha olivaceana, Riley; (Joleophora cineralla, Cham.; Orgia leurostigma, 
Har., and an unknown loaf-roller on ash. It does not seem to spin a cocoon, but eats its 
way out of the pupa in which it has transformed, usually coming out of the anterior part. 

fi.ecently it has been sent to us from Alameda County, California, where it was reared 
from the codlin moth pupa by Mr. Koebele. The Macrocentrus is, so far as we know, con- 
fined to this one host. It is apparently a more efficient destroyer of tlie pest tlian is the 
Pimpla. We have seen large series of individuals in several collections, and it is as com- 
mon at the East as it is in the West. It spins a tough brown cocoon within that of the 

There are a great many predaceous insects which feed upon the larvte while they are 
searching for suitable places to spin up, and upon the pup;e, which are poorly protected 


by the delicate cocoon. None, so far as we know, seek the larva in the apple. Professor 
Riley states that the Pennsylvania soldiev-heetle {Chauliorniathus pennsylvanicus, DeG.),and 
the two-lined sol Aier-heetle{ Tel ephorus bilineatus, Say), in their larval states feed upon the 
larvre of the codlin moth after they have issued from the apples. He also mentions the 
fact that the larvte of a species of Trogosita also helps in this good work. Dr. LeBaron 
treats of this insect at some length, but of late years it has not been found. The species 
has never been determined. Mr. Koebele has recently sent us from California two Der- 
mestid beetles, which are stated to destroy the pupse of the codlin moth. These are Tro- 
goderina tarsale and Peri meg atoitia variegntum. Experiments made indicate that they will 
kill the chrysalids in confinement, but as to destroying them in the open air on trees we 
have no absolute evidence. Mr. Koebele has, however, been instructed to make close 
observations upon this point. An undetermined soldier-bug was observed by Mr. G. W. 
Shaw, a correspondent of Dr. LeBaron's, who states that he has actually observed the bug 
to pierce an apple with its beak and draw out the apple-worm, which, however, is a state- 
ment which may be taken with a great deal of allowance. An unbred and undetermined 
coleopterous larva was received by Professor Riley, in 1874, from Professor A. J. Cook, 
with the statement that it fed upon both larvre and pupre of C'arpocapsa pomonella. This 
larva, according to Professor Riley's notes, bore a close resemblance to that of the Clerid 
Necrobia riifipes — the red-legged ham-beetle. 

Both the Pimpla and Macrocentrus are figured in the report of tlie United 
States Department of Agriculture of 1887. 


Order, Lepido-ptera ; Family, Tineidse. 

Anarsia lineatella, peach moth, or straivberry root borer (Figure No. 26), 
which has of late become quite a serious pest in our orchards, has likely- 
been imported on strawberries, on the roots of which it feeds in the Eastern 
States. I am not aware that it has proved anything troublesome to the 
strawberry growers, although it is possible that it does some damage. It 
must not, however, be confounded with the borer generally infesting straw- 
berries in this State, which lately has been determined by Professor Riley 
to be the larvse of a clear-winged moth (xgeria impropria. H. Edwards). 

As the insect demands general attention, we have deemed it well to have 
an illustration of it, copied from Saunder's " Insects Injurious to Fruits," 
from which I also take an account of its habits in the Eastern States. 

When occurring in great numbers, this insect is very injurious, playing 
sad havoc with the strawberry plants. The borer is a small caterpillar, 
nearly half an inch long, and of a reddish-pink color, fading into a dull 
yellow on the second and third segments; the anterior portion of the sec- 
ond segment above being smooth, horny-looking, and brownish yellow, like 
the head. On each segment there are a few shining, reddish dots, from 
every one of which arises a single, fine, yellowish hair. The under surface 
is paler. This borer eats irregular channels through the crown, sometimes 
excavating large chambers, at other times tunneling it in various direc- 
tions, eating its way here and there to the surface. If examined in the 
spring, most of the cavities will be found to contain a moderate-sized, soft, 
silky case, nearly full of castings, which doubtless has served as a place of 
retreat for the larvse during the winter. 

Early in June, when mature, the caterpillar changes to a small, reddish- 
brown chrysalis, either in one of the cavities excavated in the crown, or 
among decayed leaves or rubbish about the surface, from which the moth 
escapes early in July. 

The moth is very small, of a dark-gray color, with a few reddish-brown 
spots and streaks on the fore wings. The fringes bordering the wings are 
gray, tinged with yellow. Tlie nioth lays an egg on the crown of the plant 
late in July or early in August, which soon hatches; the small cateri)inar 
burrows into the heart of the plant, and remains in one of the chambers 
during the winter, occupying one of the silky cases referred to. The 


channels formed by the larvae through the crown 
and larger roots of the plant soon cause it to wither 
and die; or, if it survives, to send up weakened and 
almost barren shoots. This insect does not limit its 
depredations to the strawberry; the larvae is also 
found boring into the tender twigs of the peach tree 
and killing the terminal buds. 

In the figure I have a representation of the larvae 
and moth, both of the natural size and enlarged; 
also of an injured peach twig. 
Figiue No. 26. This luscct is kuown to attack the peach tree in 

Europe, whence it has probably been imported to this country. 

It is seen that the insect is subject to parasites. This may account for 
its disappearance in localities, and then again its presence; although the 
tendency seems to be that it is gradually spreading over the State. In 
several localities it has been so bad that half of the peach crop was infested. 
In Dr. Chapin's report of 1883, Mr. W. H. Tucker, of Folsom, is made 
the authority for the statement that it has been observed for sixteen years 
in Pleasant and Vaca Valleys. Five years ago it was first noticed on 
the University grounds. Young growing apricot shoots were found with- 
ering at the ends, and upon examination the larvae were found in them. 
All the branches showing these signs were cut off and burned. After care- 
ful search I found only two branches the next season, and since then they 
have not been seen here. Evidently parasites must greatly have helped 
us, otherwise we should never have been so easily rid of the pest. The 
peach moth requires more study before it will be possible to indicate the 
best line of defense against it. The larvaj are found under the bark of the 
tree, but from its habits as a root borer it is plain that some of them must 
harbor in the ground. It will be well to clear the trees of all of their rough 
bark in winter. In the spring all young twigs showing their presence by 
wilting should be removed and burned. Where the insect has not yet 
been known, the strictest caution should be observed against bringing any 
fruit boxes from sections known to be infested. 



California peach root borer— Remedies for— Strawberry root borer— European currant 


Sannania Pacifica (Riley). 

My first information of this new pest came from Mr. John Britton, quar- 
antine guardian for Santa Clara County, who sent me, under date of May 
twenty-second, chrysalids and larva, and a mutilated specimen of a female; 
mentioning in his letter that this borer had killed a number of trees and 
that a number of orchards were affected. In his company I visited, some 
days after, the locality, a couple of miles southeast of San Jose, and satis- 
fied myself about the dangerous character of this insect. Some two weeks 
after, in the month of June, I visited the infested orchards again, in com- 


pany with Mr. A. Koebele and Mr. H. A. Brainard, and we obtained a num- 
ber of larva and chrysalids, which Mr. Koebele took charge of. In course 
of a couple of weeks both male and female were developed, and it became 
plain that this was a different species from the eastern peach borer, and 
specimens were forwarded by Mr. Koebele to Professor Riley for identifi- 

Under date September 4, 1888, 1 received a communication from Profes- 
sor Riley, in which he says: " The yEgereid to which you refer I shall de- 
scribe under the name Sannania pacifica, as it connects through S. exitiosa 
(eastern peach borer) with S. Fitchi." 

Not having yet received Professor Riley's description, and desirous to 
give the readers an idea of this important insect, I have described it in a 
rough way myself. Whence the insect came I can only conjecture, but 
the supposition is that it is a native insect that has existed on some wild 
bush and gradually has taken to the peach trees in the neighborhood, ac- 
cording to the statement of Mr. Leigh, whose orchard has suffered for 
many years. 

Description. — Larva (Figure No. 27), pale yellow, with brown head; about an inch long, 
cocoon (Figure No. 28), brown, as all segerias; made up of the castings and glued together; 
one and one quarter to one and one half inches long. Female (Figure No. 29), fore wings, 
bluish-black opaque; hind wings, transparent veins; black fringes of both wings dark; 
antenna?, dark steel-blue; head, thorax, and abdomen of a uniform very dark blue, almost 
black, the segments marked with a faint blue line; tuft on the abdoiuen jet black; legs 
black; span of wings, one and one half of an inch. J/aZe (Figure No. 30), fore wings partly 
transparent, upper margin black, ends black, a dark bar transversely across the veins past 
tlie veins, past the middle; hind wings transparent; fringes of both wings black; antennae 
steel blue; head and thorax black; abdomen steel blue, lighter colored on the segments; 
tuft black; legs black, with yellow tuft of hair on thigh and on tibia; wing span one and 
one quarter inches. 

Figui e No. 27. Figure No. 28. 

Figure No. 29. Figure No. 30. 

The habits of this insect are similar to those of the eastern peach root 
borer, yet it differs essentially and in such a manner that it must be con- 
sidered less dangerous. 

The tunnels of this borer are almost vertical, varying from four to eight 
inches in depth, by three to four inches in width, and the disposition to 
girdle the tree does not seem to be so apparent as by the eastern borers. 
Frequently five or six borers were found which had not girdled the tree 
yet. Furthermore, it does not seem to work above ground. Its presence 
w^as noted especially on heavier land, while on ver}^ light, sand}^ soil it was 
notably absent. Its presence is also invariably indicated b}' copious gum 
exudations below ground. Its preference is peach roots, 3-et I found in- 
stances where cherries (Mazzard stock) had been affected. 



The moth lays its eggs at the base of the tree, in the months of May and 
June, and by preventing access to this we have a remedy. The fact of 
their presence being hardly felt on light, sandy soil points to the advisa- 
bility of the placing of sand from four to five inches deep around the base 
of the tree. But better than this would be a complete wrapping of the 
trunk, from several inches downward to six inches upward, with stout 
paper or paraffine paper, which is tied well or held in place by a collar of 

Remove the earth from around the tree to the depth of a few inches and 
a few inches from the tree, and fill the basin with air-slacked lime, piling 
it up a couple of inches above ground. Possibly ashes may serve the same 
purpose. All trees affected should have the wounds plastered over with 
damp clay after all the worms have been killed, and then protected as 
indicated above. 

I do not favor the use of gaslime — it may do as much harm as the 
borers themselves. 


j^geria Impropria. Order, Lepidoptera ; Family, jEgeridse. 

Fore wings, bronze black (Figure No. 33), with the internal margin 
rather broad and inclosing an orange line. The intronervular marks of 
the posterior margin are also orange, as are the edge of the discal mark; 
fringes of both wings, bronze black; antennae, steel blue; head and thorax, 
brownish black, with the collar and narrow lateral stripes pale yellow; abdo- 
men, with second and fourth segments, edged posteriorly with pale yellow; 
caudal tuft, black above, orange at the sides, black beneath, except the tip, 
which is orange; palpi, yellow above, black beneath; tip also black; legs as 
in Ag. perplex. Figure No. 32, chrysalis. 

Figure No. 31. , Figure No. 32. Figure No. 33. 

This insect is found in various portions of the State doing considerable 
damage, forcing the growers to resort to replanting much earlier than other- 
wise would be necessary. The life history of this insect has been but im- 
perfectly studied, so as to be a proper guide for means of prevention. The 
grub (Figure No. 31) passes the winter through in the larva state, feeding 
on the root. In June, probably, the mature insect issues, which lays its 
eggs right at the edge of the ground, after the manner of other «gerias. 
The common practice of flooding the vines has a great tendency to kill out 
the worms, and if the water was retained, say four to five days during the 
winter, all over the plants, doubtless all the larva? would be killed. 



JEgeria Tipuliforme. Order, Lepido'ptera; Family, jEgeridse. 

Expansion of wings, eight to ten lines; color, bluish black; palpi, yellow; 
antennffi, black; thorax, with a yellow line on each side; the breast with a 
yellow lateral spot; the abdomen of the females with three and the males 
with four very slender transverse bands. The tibia are black, with a ring, 
and the tip yellow. The fore wings have the margins and transverse bar 
black; the tip dirty golden yellow, with black veins. The larva is of a 
whitish color, with the head and feet brown, and a dark dorsal line. 

The following observations on this insect were made and recorded by 
Professor C. H. Dwinelle: 

The female of the currant borer lays her eggs singly on the wood of a year old or over, 
and usually by the side of a bud or branch. When hatched the young larva makes its 
way into the center of the stem, and taking a downward course eats out the pith for a 
distance of several inches. The borer is of a general white color, with a brown head. 
There are a few short hairs scattered over the body. Besides six true legs, there are ten 
fleshy prop legs farther baclj. When full grown the borer is nearly one half inch in length, 
and slender in proportion. In spring the borers, for the most part, assume the form of 
chrysalis; but, with other borers of this class, there is a great deal of irregularity as to 
the time of making this change. At times the insect can be found in all three forms — 
larva, chrj'salis, and mature moth. At the time for the moth to emerge the chrysalis as- 
sumes a dark-blue tint. It works its way to the opening of the burrow by a sciuirming 
motion, aided bj' sharp-pointed projections on the abdominal rings. 

Figure No. 34. 

This insect is common throughout all the currant districts of the State, 
and is one of the reasons of the short life of a currant plantation. To 
exterminate the pest is out of the question, but as remedial measures are 

1. Pruning all of the wood above two years, and burning of the same. 

2. Spraying of the vines with whale oil and sulphur, after the crop has 
been gathered. 



The flat-headed apple borer— Remedies— The sun-scald beetle— Twig borer— Wire worms. 


Chrysobothris Femorata. Order, Coleoptera; Family, Buprestidas. 

This insect affects chiefly apples, peaches, and pkims, but we have never 
found it on perfectly healthy trees. 

The larva of this insect is pale-colored, with a brown head; the fore part 
of the body being greatly flattened. The matured beetle is greenish black 
or bronze colored, copper colored on the under side. 

If any tree receives any damage to the bark, either by sunburn or other 
causes, the borer is sure to find it, and it works itself into the tree, its cast- 
ings being the only guide to its presence. The egg is evidently laid in the 
surface of the bark, and the young grub hatches, working its way to the 
heart of the tree. 


The best remedy is to prevent it from ever infesting the tree, which is done by carefully 
guarding the tree from being burned or harmed. For this purpose a three-foot long shake, 
split in two and placed on the south and west sides of the tree, answers the case well; 
wrapping with sacks may also be used, but it has the objection that the wrapping fur- 
nishes harbor for other iiiiurious insects, such as the red spider and scale. A coating of 
w^hitewash, containing some soap and sulphur, is more preferable. 

The training of a tree comparatively low, leaving a trunk of only eighteen 
or twenty inches, is one of the best preventives, but young trees must invari- 
ably be protected until the second year at least, and even after that time 
it will be well to shade the trunk of the tree. 

In training trees low it must not be forgotten to bring out smaller branches 
on the lower portions of the main branches; otherwise, in a hot and dry 
climate, these branches will suffer on the main trunk, and become infested. 
The hotter and drier a climate is, the more care must be taken to protect 
the trunk. 

If a tree has been only slightly attacked, so that half or two thirds of the bark can be 
saved, it will pay to take care of a young tree. If it go further than this, a tree will never 
become thoroughly sound, and will be outstripped ingrowth by young trees planted later. 

Whenever a borer is removed, the debris and dead wood should be entirely cleaned out 
and the smooth surface left, taking care to preserve the bark as much as possible. Then 
the wound should be smeared over with grafting wax, and a rag tied about it. In this 
manner young trees have been saved, but unless only slightly attacked they have never 
done as well as younger trees uninjured. 

There are other and similar species of borers found in the State, but they 
all, as far as we can learn, are only invited to damaged wood. 

From time to time we have received a very large larva found boring in 
decaying roots. The parent of this is a large brown beetle belonging to the 
Longicorn family, and to the genus Priunos. It will not attack healthy 



Xyloborus Xylographus. (Figure No. 35.) 

For some years it has been noticed that early in the spring 
trees, especially plums and apples, have suddenly shown all 
symptoms of drying. A close examination would generally re- 
veal the bark clear to the sapwood in a state of putrefaction. 
Invariably the tree also would be found more or less pierced with 
minute holes, and in this the little beetle figured here would be 
^. found, 

igure o. oj. r^Y^Q qIqqq resemblancc of this to the eastern blight beetle led 
me to believe that this insect was the primary cause of the tree failing; 
but I have recently arrived at the conclusion that the tree has been dam- 
aged to such an extent by the sun that the sap, being then rich in sugar, 
has fermented, causing decay, and that the insect has been attracted from 
this cause. 

The remed}^, therefore, here again, is having the trunk well protected. 
If trees are seen to be affected in this manner, they must be cut back to a 
few branches at once, and the wound dressed with grafting wax. 


Polycaon Confertus (Leconte). Order, Coleoptera ; Family, Piinidse. 

A chestnut-colored beetle, less than half an inch in length, with a very 
large head. 

This insect is a native of this State, being found originally boring in oak 
twigs. Of cultivated trees its preference seems to be the olive, but it attacks 
nearly all kinds of trees, especially apples, plums, and prunes. 

Unlike other borers, this beetle bores in its adult state, cutting down 
into the one-year old twigs below a bud, and tunneling in for a number 
of inches into the wood. Its work is by no means fatal to the tree; but, 
unless proper pruning and attention be afterwards given, it will spoil 
its shape at least. My practice has been, whenever finding them, to re- 
move the afifected branches below the burrow of the beetle, provided 
the branch can be removed without harm to the tree. When it would 
be difficult to replace a branch, as is often the case, 1 should leave it on, 
but see that the beetle is destroyed and the entrance to the hole stopped 
up— this to prevent decay and a weak branch following. 
Figure No. 36. 

Spraying with soap solutions will prevent their attack until the material 
leaves the tree, and may at times be used to advantage. The insect is 
kept in check by certain conditions, it seems, as its appearance is hardly 
noticed in some years. The present season it has been very troublesome, 
and while generally not seen after the middle of May, I have found it at 
work as late as the end of July. 

Description.— The figure gives a good idea of this voracious and troublesome beetle, 
which can often be seen with half of its body buried in a twig, and witli its strong jaws 
working farther in. Often when taken out it will bite viciously on the knife. Its general 
length IS about one third of an inch or less, but it varies much in size. The color^is 
chestnut brown. The head is conspicuously broad, almost merging into the thorax. I 
have never been able to find the beetle in its larval state. 

wiKEwoRMs. (Figure No. 37.) 

Order, Coleoptera; Family. Elateridce. 

Sometimes heavily-manured soil especially, becomes infested with small, 
slender, hard grubs, familiarly known as wireworms. These are especially 
damaging to succulent vegetables, but occasionally attack the young nur- 
sery stock. 

Figure No. 37. 

A dressing of salt, at the rate of five hundred pounds to the acre, is 
beneficial for the purpose; and, in England gaslime, according to Miss 
Ormerod, has been also used with success. One thousand pounds to the 
acre could also be used with impunity, provided it is not thrown up against 
the plants. 

The mature insect, which is developed from the wire worm, is the click- 
beetle, well known for the way it snaps its body together when touched. 



Cutworms — Remedies for — Clisiocampa — Methods for destrojdng the caterpillars — The 
fall webworm — Arsenical poisons — Tussock moth — The red-humped caterpillar. 


Order, Lepidoptera; Family, Noctuidse. 

Sometimes, in the early part of the season, not only our vegetables and 
grapevines, but also young trees are completely stripped of their foliage, 
and the only trace of an insect at work we find is their castings. Upon 
sgraping the loose dirt around the trees a fat, soft, dull-colored worm will 
be found. This is the so called cutioorm, of which a number of species 
are found in the State, chiefly belonging to the species Agrotis and the 
family of Noctui, or owlet moths. In appearance and habits these cutworm 
moths resemble each other very much. They are nearly all dull-colored 
brown and gray mottled, changing in the ground to a brown chrysalis. The 
moth flies at night and the worm hides during the heat of day, working 
chiefly at night.. 



The following was recommended by the United States Entomologist 
some years ago, and seems to work well: 

Take cabbage leaves and cut them up into pieces and dip them iu a solution — one pound 
of Paris green to fifty gallons of water; put three or four pieces of this around the tree, 
one end in the ground. The worm will find them and eat them. 


Order, Lepidoptera ; Family, Bomhycidx. 

There are several species of these resembling each other a good deal A 
species, presumably C. constricta, has been doing some harm this season 
in Sonoma County. This species is well described by the late Mr. Cooke, 
in his treatise on injurious insects: 

The orchard of Mr. Belong, at Navato, Marin County, was infested last spring by cat- 
erpillars — a species of the genus CUslocampa, or tent caterpillar. The caterpillar is one 
and three fourths inches in length, one fourth of an inch in diameter, and was full grown 
by the twelfth day of May. The body is sparingly clothed with soft and short hair, rather 
thicker and longer on the sides than elsewhere. The head is dark brown on each side, 
and dark brown above, leaving an inverted Y mark in the middle and front, jet black, and 
having much the appearance of a goblet, as one looks from its tail to head. The frontal 
mark is jet black, edged with a white strip across and over the mouth parts, and on each 
side of the inverted Y. The ground color of the upper part of the body is evidently blue, 
with a dorsal row of oval orange spots, one on each segment; two subdorsal orange lines; 
also, two lateral orange lines. The dorsal space not covered by dorsal spots ; between the 
subdorsal lines is crinkled with fine black and orange lines; between the subdorsal and 
lateral lines, on each side, the space is blue, slightly variegated with fine orange and black 
lines intermingled. The lower part of the body and feet are dusky blue, crinkled with 
orange and black, irregular lines, and an amber-colored ring around base of prop-legs. 
The caterpillars do not make a tent or web, although they live in colonies on the tree. The 
caterpillars spin their cocoons (Figure No. 38) in the folded leaves of the trees on which 
they feed, especially the apple. Pupa elongate, posteriorly attenuated, inclosed in a loose 
silken web, suffused in fine yellow powder. The moth appears in about sixteen days; is 
reddish brown, with two transverse, rust-brown, nearly straight, parallel lines on the fore 
wings. Male (Figure No. 40), antenuis short curved, moderately bipectinated in both 
sexes, the pectinations gradually decreasing in length to the apex, and shortest in 
females; thorax, robust, pilose (hairy); abdomen, elongate, robust in female, and tufted 
in both; femura (thigh) and tibia (shin) hairy. It expands one and three fourths inches. 

Figure No. 38. 

Figure No. 39. 

Figure No. 40. 

The female moth (Figure No. 39) lays her eggs, about two hundred in number, in rows 
around the new growth of wood, and covers them with an apparent waterproof substance, 
to protect them through the winter season. About the time the leaves are unfolding in 
the spring the voung hatch out and feed on the foliage and young fruit. Mr. DeLong 
had a block of two thousand apple trees completely stripped of fruit and lohage. 

Method Adopted by Mr. DeLong for Destroying the Caterpillars. 
He placed a band of butter-cloth about four inches wide, covered with tallow, on the 
trees about two feet aliove the ground. He discovered that the caterpdlars could form 
bridges over the tallow, especiallv at night. Over the tallow he placed soft lard, which 
proved effective. He then swept the caterpillars off the branches on to the ground. The 
caterpillars attempted to ascend the tree again, but would not cross the greased band. 
While thus gathered between the bands and the ground they were destroyed in great 
numbers. To clean twentv-two thousand trees in this way it cost seven and one half 
cents per tree, and the work done in less than four weeks. Although the orchard is not 
thoroughly cleaned, Mr. DeLong saved the greater portion of his crop of twenty thousand 
trees for this season. These caterpillars can be effectively exterminated by carefully ex- 


amining the young wood before the tree is leafed out, and picking off and destroying 
the bunches of eggs; also the picking off and destroying of any cocoons found on the 
trees— there is often found a leaf folded containing six or seven cocoons. However, :\Ir. 
DeLong is confident he can exterminate them next season, by placing the greased bands 
on the trees and shaking off the young caterpillars. 

Fortunately, nature in this case also comes to the rescue, and in 1882 a 
small fly, belonging to the Ichneumonid^ , became numerous, and the year 
after it was hardly possible to find a caterpillar. A year ago, 1887, I vis- 
ited the place, and but very few larva could be found. Specimens, how- 
ever, have been sent from portions of Sonoma. 

THE FALL WEB-WORM. (Figure No. 41.) 

Hyphantria Cunea (Drury). Order ^ Lepidoptera ; Family, Bomhycidx. 

For the last two years, to my knowledge, the Ameirican black walnut 
trees {Jugkms nigra), and also some few California walnuts {Juglans cali- 
fornica) growing on the streets in the town of Santa Cruz, have been infested 
with a hairy, brownish caterpillar spinning large tents. This year they 
have especially been numerous. After trying for some time, I finally suc- 
ceeded in raising a moth, which has been identified by Mr. D. W. Coquilett as 
the true fall webworm, which is also well described in Professor Riley's report 


for 1886. The insect has during the last years been very abundant in 
many portions of the East, and it seems there to have attacked a great 
variety of trees. I have not seen it feed in nature on any but walnut trees, 
in fact not on the so called English walnut {Juglans regra), although the 
tree is abundant in Santa Cruz. However, that it will feed on this species 
I am satisfied, as leaves of this tree fed in confinement were greedily eaten. 

My poor success in raising so few moths is due to the happy fact that 
the insect has very numerous parasites, and were it not that these again 
are being destroyed by still smaller parasites, the fall webworm would soon 
be a thing of the past. 

Of the parasites found among the debris of the webworm, one has been 
identified as the Limneria pallipes Prov., a hymnopterous parasite mentioned 
by Professor Riley as one of the principal destroyers of the fall webworm. 

The followdng description is taken from Professor Riley's report of 1886: 


Limitation of Broods.— At Washington I may saj' in general that thetirst brood appears 
soon after the leaves have fully developed, and numerous webs can be found about the 
first of June, while the second brood appears from the middle of July on through August 
and September. In Massachusetts and other Northern States the first moths issue in June 
and July; the caterpillars hatch from the last of June until the middle of August, reach 
full growth and wander about seeking places for transformation from the end of August 
to the end of September. 

The species invariably hibernate in the chrysalis state within its cocoon, and the issu- 
ing of the first brood of moths is, as a consequence, tolerably regular as to time, i. e., they 
will be found issuing and flying slowly about during the evening, and more particularly 
at night, during the whole month of May, the bulk of them early or late in the month, 
according as the season may be early or late. They couple and oviposit very soon after 
issuing, and in ordinary seasons we may safely count on the bulk of the egg being laid by 
the end of Maj^ During the month of June the moths become scarcer, and the bulk of 
them have perished by the middle of that month, while the webs of the caterpillars be- 
come more and more conspicuous. The second brood of moths begins to appear in July, 
and itsocurrence extends over a longer period than is .the case with the first or spring 
brood. The second brood of caterpillars may be found from the end of July to the end of 
Seiitember, hatching most extensively, however, about the first of August. 

The following general remarks upon the different stages refer to Washington and local- 
ities where the same conditions hold: 

The female moth deposits her eggs in a cluster on a leaf, sometimes upon the upper and 
sometimes on the lower side, usually near the end of a branch. Each cluster consists of 
a great many eggs, which are deposited close together and sparsely interspersed with hair- 
like scales. In three instances those deposited by a single female were counted. The 
result was three liundred and ninety-four, four hundred and twenty-seven, and five hun- 
dred and two, or an average of four hundred and forty-one eggs. But in addition to such 
large clusters each female will deposit eggs in smaller and less regular patches, so that at 
least five hundred eggs may be considered as the real number produced by a single indi- 
vidual. The egg, measuring 0.4 mm, is of a bright, golden-yellow color, quite globular, 
and ornamented by numerous regular pits, which give it under a magnifying lens the ap- 
pearance of a beautiful golden thimble. As the eggs approach the time of hatching this 
color disappears and gives place to a dull, leaden hue. 

The interval between the time of depositing and hatching of the eggs for the first brood 
varies considerablj% and the latter may be greatly retarded by inclement weather. Usu- 
ally, however, not more than ten days are consumed in maturing the embryo within. The 
eggs of the summer brood seldom require more than one week to hatch. 

Without check, the offspring of one female nioth might in a single season (assuming 
one half of her progeny to be female, and barring all checks) number one hundred and 
twenty-five thousand caterpillars in early fall — enough to ruin the shade trees of many a 
fine street. 

The Larvx. — The caterpillars just born are pale j^ellow, with two rows of black marks 
along the body, a black head, and with quite sparse hairs. When full grown, they gener- 
ally appear pale yellowish or greenish, with a broad dusky stripe along the back and a 
yellow stripe along the sides ; they are covered with whitish hairs, which spring from 
black and orange-yellow warts. The caterpillar is, however, verj' variable both as to depth 
of coloring and as to markings. Close observations have failed to show that different food 
produces changes in the coloration ; in fact nearly all the various color varieties may 
be found upon the same tree. The fall generation is, however, on the whole, darker, with 
browner hairs, than the spring generation. 

As soon as the young caterjjillars hatch they immediately go to work to spin a small 
silken web for themselves, which by their united efforts soon grows large enough to be 
noticed upon the trees. Under this protecting shelter they feed in company, at first de- 
vouring only the green upper portions of the leaf, and leaving the veins and lower skin 
unmolested. As they increase in size they enlarge their web by connecting it with the 
adjoining leaves and twigs; thus as they gradually work downwards their well becomes 
quite bulky, and, as it is filled with brown and skeletonized leaves and other discolored 
matter as well as with their old skins, it becomes quite an unpleasant feature in our pub- 
lic thoroughfares and parks. The caterpillars always feed underneath these webs; but as 
soon as they approach maturity, which requires about one month, they commence to scat- 
ter about, searching for suitable places in which to spin their cocoons. If very numerous 
upon the same tree the food supply gives out, and they are forced by hunger to leave their 
sheltering homes before the usual time. 

When the young caterpillars are forced to leave their web they do not droji siuldenly to 
the ground, but suspend themselves by a fine silken thread, by means of which they easily 
recover the tree. Grown caterpillars,' which measure 1.11 inches in length, do not spin 
such a thread. Both young and old ones drop themselves to the ground without spinning 
when disturbed or sorely pressed by hunger. 

Pupa and Cocoo?i.— Favorite recesses selected for pupation are the crevices in liark ami 
similar shelters above ground, in some cases even the emjity cocoons of other moths. 
The angles of tree boxes, the rubbish collected around the base of trees, and other like 
shelters are employed for this purpose, while the second brood prefer to bury themselves 
just under the surface of the ground, provided that the earth be soft enough for that jmr- 
pose. The cocoon itself is thin and almost transparent, and is composed of a slight web 
of silk intermixed with a few hairs, or mixed with sand if nuide in the soil. 


The pupa is of a very dark-brown color, smooth and polished, and faintly punctuate. It 
is characterized by a swelling or bulging about the middle. It is 0.60 of an inch long and 
0.23 of an inch broad in the middle of its body. 

The Moth. — The moths vary greatly, both in size and coloration. They have, in conse- 
quence of such variations received many names, such as cunea (Drury), textor (Harr.), 
^punctata (Fitch), punctatissima (Smith). But there is no doubt, as proven from frequent 
breeding of specimens, that all these names apply to the very same insect, or at most to 
slight varieties, and that Drury's name cunea, having priority, must be used for the species. 

The niost frequent form observed in the vicinity of Washington is white, with a very 
slight fulvous shade. It has immaculate wings, tawny-yellow front thighs, and blackish 
feet. In some specimens the tawny thighs have a large black spot, while the shanks on 
the upper surface are rufous. In many all the thighs are tawny yellow, while in others 
they have scarcely any color. Some specimens (often reared from the same lot of larvre) 
have two tolerably distinct spots on each front wing, one at base of fork on the costal 
nerve and one just within the second furcation of the median nerve. Other specimens, 
again, have their wings spotted al) over and approach the form punctatissima, described as 
the many-spotted ermine-moth of the Southern States. The wings of the moth expand 
from one inch and a quarter to one inch and three eighths. The male moth, which is usu- 
ally a little smaller, has its antenna; doubly feathered beneath, while those of the female 
possess instead two rows of minute teeth. 

The pupa state lasts from six to eight days for the summer brood, while the hibernating 
brood, however, requires as many months, according to the latitude. 

I have given considerable space to the description of this insect as, judg- 
ing from its increase in Santa (^riiz, it may perhaps prove as great a nui- 
sance as it has been in many portions of the East, where it two years ago 
especially defoliated nearly all the shade trees in Washington City. 


The remedies recommended in the Eastern States might be used with 
advantage here: 

Burning the nests as soon as they appear, with torches of rags soaked in kerosene. 

A special and very handy kind of torch is recommended for the purpose, and is known 
as the brick torch. 

Take a piece of soft brick, trim it to egg shape; then take two soft wires, cross them 
on the brick, wrapping them together round the opposite side so as to firmly secure it: 
now tie this end to a long stick by wrapping around it; then soak the brick in coal oil, 
light it with a match, and it is ready. 

Arsenical Poisons. 
Both Paris green and London purple are recommended, mixed with flour. When used 
early during the first appearance of the worms, it can be used stronger. I should not rec- 
ommend to use it more than one pound to one hundred and eighty gallons of water, and 
London y^urple one pound to two hundred gallons. 

TUSSOCK MOTH. (Figure No. 42.) 
Orygia Leucostigma. Order, Lepidoptera ; Family, Bomhycidse. 

Figure No. 42. 

The engraving gives a fair idea of the larva or caterpillar of the tussock 
moth, which is often found in orchards bordering on woods, especially in 
Santa Cruz and Sonoma Counties. The ground color of the larva is light 
yellow, sparingly clothed with fine yellow hairs on the sides of the body, 
and having four short and thick brush-like j^ellow tufts on the back, that 
is, on the fourth and three following rings; two long black plumes or pen- 
cils extending forward from the first ring, and a single plume on the 
eleventh ring. The head and the two little retractile warts on the ninth 
and tenth rings are coral red; there is a narrow black or brownish stripe 


along the top of the back, and a wide dusky stripe on each side of the 

The female is almost wingless, and for this reason their spreading is slow 
and could be entirely prevented by placing bands with sticky material 
which is used to capture the wingless female of the canker worm. As a 
general thing the damage is not very serious, and the caterpillars being 
very conspicuous they can easily be seen and destroyed. The eggs are laid 
on the cocoon and are covered with a large quantity of frothy matter, 
which, on exposure, becomes hard and brittle. The wingless female has 
a large heavy body, and is of a light gray color. The male has large gray 
wings marked with darker stripes. 


Notodonta Concinna. Order, Lepidoptera; Family, Bomhycidx. 

The name given to this insect is a very good one, being taken from its 
most characteristic point. 

It has been reported in various portions of the State, and proved itself 
quite troublesome in certain parts of Sonoma for some seasons past, feed- 
ing principally in apple trees. 

Evidently it has two broods in the season — perhaps three — as I saw it there in Jul.v, and 
specimens of the larv£e were sent to me again this fall. The insect is well known in the 
East and is well described by Harris. As it has not been mentioned here in any previous 
report, we take the liberty of copying from him. The eggs from which they proceed are 
laid in the month of July, in clusters on the under side of the leaf, generally near the end 
of a branch. When first hatched they eat only the substance of the under side of the leaf, 
leaving the skin of the upper side and all the veins untouched ; but as thej' grow larger 
and stronger, whole leaves from the point to the stalk, and go from leaf to leaf down the 
twigs and branches. The j'oung caterpillars are lighter colored than the old ones, which 
are yellowish brown, paler on the sides, and longitudinally striped with slender, black 
lines; the head is red; on the top of the fourth ring there is a bunch or hump, also of a 
reddish color; along the back are several short black prickles; and the hinder extremity 
tapers somewhat, and is always elevated at an angle with the rest of the body, when the 
insect is not crawling. The full grown caterpillars measure one inch and a quarter, or 
rather more, in length. They rest close together on twigs when not eating, and some- 
times entirely cover small twigs and ends of branches. The early broods come and 
leave the trees by the middle of August, and the others between this time and the latter 
part of September. All the caterpillars of the same brood descend at one time, and dis- 
appear in the night. They conceal themselves under leaves or just beneath the surface 
of the soil, and make their cocoons, which resemble those of the unicorn (Notodonta). 
They remain a long time in their cocoons before changing to clirysalids, and are trans- 
formed to moths towards the end of June or the beginning of July. Mr. Abbott states 
that in Georgia these insects breed twice a year, the first broods making their cocoons 
towards the end of May, and appearing in the winged form fifteen days afterwards. This 
Notodonta is a neat and trim-looking moth, and hence is called concinna. It is of a light- 
brown color; the fore wings are dark brown along the inner margin, and more or less 
tinged with gray before; there is a dark-brown dot near the middle, a spot of the same 
color near each "angle, a very small triangular whitish spot near the shoulders, and several 
dark-brown longitudinal streaks on the outer hind margin ; the hind wings of the male 
are brownish or dirty white, with a brown spot on the inner hind angle. Those of tlie 
other sex are dusky brown; the body is light brown, with thorax rather darker. The 
wings expand from one inch to one inch and three eighths. 


As they maintain their gregarious habits during their entire larval state, they can be 
gathered or destroyed either by cutting off the limbs" they are on or by jarring the branches. 

When but a few" caterpillars are seen handpicking will suffice. Where they are num- 
erous spraying -with Paris green, at the rate of one pound to two hundred gallons, would 
be useful. This caterpillar is especially fond of apple and plum 'eaves. 



Diabrotica soror — Remedies — Pear or cherrj' sing — Red mite or spider — Yellow mites — 
Remedies for mites. 


Diabrotica Soror (Figure No. 43). Order, Coleoptera; Fam,., Chrysomelidee. 

The Diabrotica soror is a very close relation of the D. 12 punctata which 
occurs in the East, and has often been mistaken for the same. Of all the 
leaf beetles found in the State, none is more destructive in certain localities 
and in certain seasons than this species. 

The imperfect engraving gives an idea of its appearance. The head is 
black; the wing cases 3^ellowish green, with twelve distinct black spots. 
Unfortunately, this insect is so common that it hardly needs to be de- 
scribed. Being often associated with two or three species of ladybugs, it 
is often thought by people to be one of them. A little closer examination 
will reveal the fact that it has four joints in the toes, while a lady- 
bug has only three. It is to be regretted that we still are in igno- 
rance of the manner this insect hibernates. The mature insect' 
is found rarely during the winter, and the presumption is that. _ 
eggs are laid on grasses and other plants during the fall, and Fisme no. 43. 
that the larva feed on the roots of plants. The Diabrotica is especially 
bad near sandy watercourses and gravelly land, and its increase is always 
favored by the cultivation of corn and other vegetables in the orchard. 

It must be said that no verj' successful nor thorough remedy has been found for this 
pest, and I can onlj' offer the partial remedies previously recommended; namely, spray- 
ing with Professor "Riley's kerosene emulsion, but the spraying must be done early in the 
morning, when the insects are sluggish. This remedy can only be used when the insects 
appear early, while the fruit is still small. It will prevent the insects from destroying the 
leaves. Later on, fumigation seems to be the only practical way of driving them from the 
orchard. On the San Joaquin River, the striped squash bug (also a diabrotica) is kept at 
bay by lighting smudge fires, on which a little wood tar is placed. This method will prob- 
ably prove as efficacious against the spotted diabrotica. 


Selandria Cerasi. Order, Hymenoptera; Family, Tenthredinidse. 

This insect takes its name from the resemblance in the larval state to a 
snail or slug. The parent is a small black fly, which deposits its egg on 
the upper surface of leaves, where it can be seen as a small white speck. 
The larva hatches from the egg in a few days, and commences to eat the 
green part of the leaf, leaving only portions of the epidermis. When full 
grown, it drops to the ground and transforms. Often three to four larva? 
are found on the leaf. In such a case the leaf will be completely stripped, 
and when trees are badly infested the influence will be felt next year, fruit 
spurs being but imperfectly developed. 

When these insects appear later in the season, the throwing of dust with a shovel on 
the tree, or better, air-slacked lime, is sufficient. But if they make their appearance early 
in the season, spraying should be resorted to, that all the eggs may be killed. For this 
purpose the sulphide of soda and soap wash is excellent. 



Nematis Species. 

This insect is closely allied to the former, but its mode of attack is differ- 
ent. While the pear slug devours only the fleshy part, this insect eats the 
whole blade of the leaf, leaving often only the ribs. 

The eggs are laid in a slit in the leaf, cut by the ovipositor of the female. 
The young larva eats a hole through the leaf and keeps enlarging this as it 
grows. The larva full grown measures half an inch in length, has thoracic 
legs, twelve pro legs, and two anal pro legs; the general color, greenish yel- 
low; eyes, black. 

The adult insect is described by the late M. Cooke as having a span of 
wings of three fifths of an inch, the body three tenths of an inch in length; 
the upper part of the head and thorax black; abdomen yellow, with black 
transverse bands on dorsal half of each segment; wings clear, of a brown- 
ish hue. 


Spraj'ing with paris green, at the rate of one pound to one hundred and eighty gallons 
of water, is a good remedy; if this is objectionable, white hellebore, one teaspoonful to a 
bucketful of water, is reported as doing good service. 


Tetranychus Telarius. 

This insect is probably a native of the State, as I have found it almost 
everywhere on wild bushes and weeds, and very few orchards are truly 
exempt from it. It is found on evergreen as well as deciduous trees, and 
is, especially in dry seasons, and in localities where the air is dry, quite a 
formidable pest. 

The varieties of trees most affected by it are the almond and the prune, 
but many varieties of plum sufTer severely, as well as pears and apples. 
The mite hatches in the springtime, often with the expanding first leaves 
and blossoms, from eggs laid in the fall of the year, and just before hatch- 
ing turn a very bright red, which, when they are numerous, color the trunk 
red; the empty cases remain on the tree and are transparent white. Unfor- 
tunately all insects do not hatch at once, but in course of many weeks, and 
this makes their total destruction very ditiicult, as when in the egg state 
they are extremely hard to kill. 

The larva of the red spider has only six legs, but, after having pupated, 
it comes out a perfect insect with eight legs. 

The red spider injures the leaves and the tender twigs b}' eating portions 
of the epidermis, and being very numerous, soon cause the leaves to lose 
their bright color; they become of an ashen hue — a very characteristic mark 
of the presence of the mite. 


In the interior of the State a yellow species of mite is often found doing 
much damage to pear trees. The remedies adopted for the red spider are 
equally as effectual. Young nursery stock attacked has been kept very 
clean by frequent sprayings of cold water. 


To destroy this insect in the egg state is a very hard matter, anything found strong 
enough daniaging the tree. We have, therefore, to resort to washes during the suinnier 
or spring. For this purpose sulpliur washes seem especially adapted. We know of noth- 
ing better than the sulphide of soda and soap wash, applied copiously to the tree as soon 


as the insects make their appearance. Two washings, at least, are necessary to do effi- 
cient work. Many prefer a washing after the fruit is off; I should prefer one in June and 
another in September. 

The most successful cleaning of tree for the red spider I have lately observed is where 
abundance of sulphur was used in the solution, in fact, as much as could be carried in the 
solution — about five pounds to the one hundred gallons; when difficulty is experienced to 
get such quantity through the nozzle, the San Jose nozzle, with rubber substituted for 
the brass disk, is the best. 



Ladybirds or bugs — The brown-necked lady bug — Lace- wing flies — Podabrus beetles — 
Syrphus flies. 



The usefulness of the ladybugs in destroying aphis of all kinds is familiar 
to most persons having observed these pretty little insects. Yet the very 
great role they play in keeping the myriads of aphis and scale insects in 
check is not as fully appreciated by many as it ought to be. Indeed, were 
it not for the interference of those insects, the very ground would be covered 
with aphis, and our grain, flowers, and fruit trees destroyed by the various 
numbers of the homoptera or true bugs. 

Among insects very conspicuous for their predaceous habits, I have 
especially had occasion to observe four families of insects. These are true 
beetles undergoing the usual transformation of the highly developed insect. 
The eggs are yellow, somewhat pointed, and laid in bunches on bark and 
leaves of trees or plants. The larva produced from this is a curious little 
creature, soft, worm-like, tapering to both ends, is provided with six legs, 
and is quite active. Some of the larva, as the ordinary ladybugs of the 
genus Coccinella, are naked bluish, with yellow spots; others, like Scymnus, 
are covered with short hairs, and those of the Chilocorus are provided with 
soft black spines. It is in the larval state that these insects do the most 
good. Thus it was larva I found feeding inside the egg-sac of the fluted 
scale. . ^u. 44. 

It is in the larval state that the Chilocorus, or black red-spotted lady))ug, 
does its best work feeding on the various scale insects, and it does its work 
sometimes so thoroughly that in some instances the scale has been appar- 


ently exterminated. In this State we have a number of ladybiigs Ijelong- 
ing to the genus CoccineUa and Hippodamia. These, as a general thing, 
feed on aphis of all kind in their larval state, hut are also very active in the 
imago state feeding on woolly aphis. 

The Chilocorus has been referred to and the figure shows it in its various 
stages from larva to imago. The chrysalis shows the characteristic appear- 
ance of most ladybugs. The Chilocorus bivulneris is the most common 
species, having been observed from Shasta to San Diego. Preying on the 
native scales of the woods, it has gradually extended its operations to the 
orchards, and is met with in nearly every infested district and has proba- 
bly done more good than any other species, unless it should be its modest 
and obscure little cousin, the brown-necked lady bug, to which we draw 
special attention. 


Scymnus Ma rgi nicollis. 

From time to time attention of entomologists has been 
drawn to the members of the genus which all seem to have 
y proved themselves very useful in preying on various scale in- 
^ sects, and even on phylloxera. In California the species fig- 
ured above, Scymnus marginicollis, is quite common. In an 

Figure -15. articlc in the ''Pacific Fruit Grower," Mr. D. W. Coquillett 
proposes the name brown-necked ladybug, and speaks of the larva having 
been found by Mr. A. S. Chapman and I on his place at San Gabriel feed- 
ing on the eggs of Icerya purchasi. 

The larvas of the species are of the usual form of ladybug larva\ The 
body is of yellowish-gray color, thickly covered with a white, mealy powder, 
which is gradually rubbed off, and with a covering of white matted hair: 
their heads are of a pale yellow color. They pass through the chrj^salis 
form in about a week, and appear as fully developed ladybugs. Its head 
and throat are reddish brown. The wing cases are black, but covered with 
peculiar whitish hair, which are turned in the manner shown in figures. 
In the summer time, especially in a dusty country, fine particles of dust 
adhere to these and gives the insect a gray color so closely resembling the 
bark that they can only be noticed by looking very sharp for them. 

I have often heard it stated that much damage has been done by the 
ladybug, and have indeed often seen them helping the diabrotica to devour 
overripe fruit and eating up the squash vines. It should be remembered by 
those people who have complained bitterly over the harm done by them, 
that were it not for their presence there would have been no squash vines 
to eat and no leaves or fruit on the trees, as the aphis would have destroyed 
them. As a general thing little damage is done by the ladybug as com- 
pared with the good it does, as it is only ripe fruit that suffers. 

LACE-WING FLY (Figure No. 46). 

Chrysopa Species. 

The engraving (Figure 47) shows the larva of this useful insect, which 
has been called aphis lion, on account of its great appetite for these insects. 
It is of grayish color, banded with white. The eggs are very conspicuous, 
planted as they were on a long stalk, resembling certain kinds of mold. 
The adult insect is delicate looking, with large transparent wings, large 


Figure No. 46. Figure No. 47. 

golden eyes (hence the name Chrysopa). It is seen flying lazily around 
infected trees or plants. 

The larva of the Chrysopa is known to devour fruit and vegetables, 
but this is an exception, it being a great help in the extermination of aphis, 
and we recall the fact of their usefulness in South Africa, in preying on the 
fluted scale, a habit they have sparingly taken to in this State also. 


The Podahrus is a genus of beetles, which also have several members 
which play an important part in keeping the aphidians in check. In 
Berkeley I have observed them to be very numerous certain seasons; large 
patches of grain being cleaned of aphis chiefly by their agency. The Poda- 
hrus is readily known by its yellow feathery antennae, yellow legs and body, 
and black wing covers. Their flight is slow, and they are readily caught 
when hovering over the grain. 


The appetite of the blind larvae of these insects is something enormous. 
This spring, when they were found very abundant, feeding upon the plum 
aphis, I took home at noon two leaves covered with the aphis and with 
two larvae on each, and left them on a table. In the evening I examined 
the leaves, and found nothing but empty skins of aphis. The aphis had 
all been devoured by the syrphus larva?, and these were still hungrj^ for 
more. In Mr. Hubbard's report of insects injurious to the orange, I find 
the following; precise and interesting description of the syrphus flies: 

Whenever colonies of aphis are found on the orange there will almost invariablj' be 
found among them slug-like larvne, which creep about among the plant lice with a leech- 
like movement, now contracting into an almost globular mass, and again elongating like 
the joints of a telescope. The minute terminal joint, which constitutes the head of the 
larvae, is observed to possess a pair of retractile, horny hooks, which work forwards and 
back, in and out of the mouth, like a rake. As the larva advances with a groping motion, 
for it is quite blind and eyeless, the outstretched head and neck sweep the surface, and the 
jaws continue their raking movement until they strike the body of an aphis. Immedi- 
ately the jaw-hooks grapple their unresisting victim, and soon through the transparent 
walls of the body the sucking stomach is seen pulsating and drawing through the oesopha- 
gus, in a continuous stream, the green juices of the plant louse. 

When actively engaged in feeding these larvae continue with the greatest voracity to 
empty one louse after another, until they have destroyed dozens of them : and their bodies 
distended with the contained juices become translucent green in color. When lilled to 
repletion, the larva falls into lethargy, lasting two or three hours; during which the pro- 
cesses of digestion change the juices of the bodj' to varying shades of brown, and dark 
masses of fecal matter gradually form in the intestines. The curious changes of color in 
the semi-transparent larva? are therefore due entirely to the condition of the body con- 
tents. The full fed individuals usually have a tinge of flesh color, owing to the formation 
of glandular, creamy masses of fat, which have a roseate hue. When fasting through 
scarcity of food the fat is absorbed, and the body becomes dark brown and opaque. When 
feeding, the larva is translucent green; while digesting, the colors change to olive and 
brown, with distinct nuirkings of reddish brown and black. 

Transformations. — When full fed, the larva attaches itself b.y means of a pair of terminal 
prop legs, aided by a viscid secretion which it voids, and which, in drying, glues it to the 
surface of the plant. The body becomes distended and thickened, losing in length what it 
gains in girth. The skin of the larva is not split or shed, but hardens and forms the 
puparium, which jirotects the true pupa within. In the puparium the shape of the larva 
is jirofoundly altered, the l)ody joints are obliterated, the anterior end becomes swollen 
and broadly rounded, and the'form tapers suddenly behind. 


The perfect fly issues by pushing ott the convex end of the puparium, which splits at 
the suture between two of the old larval joints, and releases a circular cap in the shape of 
a watch-glass. 

The duration of the egg and larval periods of these aphis-eating flies is short; the egg 
hatches in forty-eight hours after it is laid, and the larva becomes full grown and forms its 
pupa in five or six days. About ten days, the average time of insects having many broods, 
are passed in pupa. The reason of this extremely rapid development in the first two stages 
— the egg and larva — becomes obvious when we consider how brief is the existence of the 
aphis itself, and how suddenly its colonies appear and disappear — for the life of a colony 
of aphis is also very short. Upon the orange the aphis can feed onlj^ on the verj^ tender 
young leaves: in a short time these harden, and then the colony must scatter; biit fre- 
quently long before that time their numbers are reduced almost to extermination by ene- 
mies and parasites. As the syrphus larvre cannot follow the winged insects, they must 
make the best of their limited o])portunities and ffeed quickly or perish of starvation. It 
is curious to mark how nature in the case of these insects has responded to the necessi- 
ties of the situation and given their larvpe restless activity, great rapacity, and destructive 
powers, notwithstanding their slow locomotion, and also a remarkably brief egg period, so 
that this wingless, blind, and almost legless maggot is enabled to compete with more per- 
fectly organized rivals in the food struggle which takes place over every aphis colony. 

Broods, etc. — The larva3 of these sj-rphus flies feed only upon aphis, and depend vipon 
them for their existence. They therefore appear and disappear with the colonies of the 
latter, and the broods may be supposed to follow rapidly one upon another during the sea- 
sons of growth, when the appearance of new shoots upon the orange gives support to 
numerous colonies of aphis. 

The seasons of growth in the orange, after the renewal of the folage in the early spring, 
depend in a great measure upon the prevalence of rains, and varj^ from year to year, but 
are usually three or four in number during the year. The colonies of aphis, and likewise 
their syrphus enemies, are most abundant in June and September. 

Three representatives of the family Sijrphida are found among aphis on the orange. 
They belong to the genus Baccha.